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Canada FluWatch Weekly Reports 2010-2011 Season Week 20 - 224 deaths total (excluding BC, QC, NB and NU)

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 47

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 47

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>November 21 to November 27, 2010 (Week 47)


</TD></TR></TBODY></TABLE></B>

Posted 2010-12-03


Summary of FluWatch Findings for the Week ending November 27, 2010
  • During week 47, the overall influenza activity in Canada remained relatively low, however, activity level in some regions of the Prairies, Ontario and Quebec has slightly increased.
  • The proportion of positive influenza specimens reported during week 47 has doubled this week with 111 specimens out of 2,418 (4.59%) testing positive. Of the 111 positive tests, 39 specimens were reported as influenza A/H3N2 (AB, MB, ON & QC), 63 as unsubtyped influenza A (AB, SK, MB, ON & QC) and nine as influenza B (AB, SK & ON).
  • Since the beginning of the season, A/H3N2 has been the predominant strain circulating in Canada representing 98% of the subtyped positive influenza A specimens. Seasonal influenza B and A/H3N2 viruses continued to co-circulate worldwide, with the later slightly predominant; pandemic H1N1 2009 virus circulation continued to be detected at low to moderate levels across Asia, and sporadically in other parts of the world.
Overall Influenza Summary ? Week 47 (November 21 to November 27, 2010)

In week 47, while two regions reported localized activity (ON & QC), eleven regions reported sporadic activity (AB, SK, MB, ON & QC) and 42 regions presented no activity (See Activity level Map). One new unsubytped influenza A outbreak was reported during week 47 in a QC long-term care facility.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 47



</TD></TR><TR class=alignCenter><TD>

</TD><TD><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD>No Data </TD><TD>
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</TD></TR><TR class=alignCenter><TD>No Activity</TD><TD>
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</TD></TR><TR class=alignCenter><TD>Sporadic Activity</TD><TD>
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</TD></TR><TR><TD>Localized Activity</TD><TD>
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</TD></TR><TR><TD>Widespread Activity</TD><TD>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 47, the national ILI consultation rates was 21.0 consultations per 1,000 patients visits which was similar to what was observed in the previous weeks and was within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (69.8 per 1,000 consultations) followed by people aged between 5 and 19 years (20.7 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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-->Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 47 (4.59%, 111/2,418) continued to increase. This proportion was higher than what was usually observed at this time of the year but much lower than during H1N1 2009 pandemic (see Tests table and Influenza tests graph). Of the 111 positive tests, 39 specimens were reported as influenza A/H3N2 (AB, MB, ON & QC), 63 as unsubtyped influenza A (AB, SK, MB, ON & QC) and nine as influenza B (AB, SK & ON). Although the majority of influenza virus detections to date this season were influenza A viruses (93% or 296/317) detections for influenza B viruses are also increasing. Since the beginning of the season, 98% of the subtyped positive influenza A specimens were for influenza A/H3N2.During week 47, 38% (12/32) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged over 65 years, while since August 29, 2010, the proportion was 49% (52/107) (see Tests detailed table). In week 47, low levels of respiratory syncytial virus detections (RSV) (3.8%), adenovirus (3.1%), parainfluenza (2.9%), and human metapneumovirus (0.6%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>*Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (November 21 to November 27, 2010)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to November 27, 2010)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>19</TD><TD class=alignCenter>0</TD><TD class=alignCenter>18</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>51</TD><TD class=alignCenter>0</TD><TD class=alignCenter>26</TD><TD class=alignCenter>0</TD><TD class=alignCenter>25</TD><TD class=alignCenter>7</TD><TD class=alignCenter>155</TD><TD class=alignCenter>0</TD><TD class=alignCenter>62</TD><TD class=alignCenter>3</TD><TD class=alignCenter>90</TD><TD class=alignCenter>12</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>38</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>36</TD><TD class=alignCenter>0</TD><TD class=alignCenter>97</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>0</TD><TD class=alignCenter>78</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>102</TD><TD class=alignCenter>0</TD><TD class=alignCenter>39</TD><TD class=alignCenter>0</TD><TD class=alignCenter>63</TD><TD class=alignCenter>9</TD><TD class=alignCenter>298</TD><TD class=alignCenter>0</TD><TD class=alignCenter>119</TD><TD class=alignCenter>3</TD><TD class=alignCenter>176</TD><TD class=alignCenter>21</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(November 21 to November 27, 2010) (37/111)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(August 29, 2010 to November 27, 2010) (135/317)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>17</TD><TD class=alignCenter>1</TD><TD class=alignCenter>14</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>24</TD><TD class=alignCenter>0</TD><TD class=alignCenter>22</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2</TD><TD class=alignCenter>5</TD></TR><TR><TD>65+</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>60</TD><TD class=alignCenter>0</TD><TD class=alignCenter>52</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>35</TD><TD class=alignCenter>0</TD><TD class=alignCenter>32</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2</TD><TD class=alignCenter>126</TD><TD class=alignCenter>3</TD><TD class=alignCenter>107</TD><TD class=alignCenter>16</TD><TD class=alignCenter>9</TD></TR></TBODY></TABLE>

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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w47_10/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 48

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 48

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>November 28 to December 4, 2010 (Week 48)


</TD></TR></TBODY></TABLE></B>

Posted 2010-12-10


Summary of FluWatch Findings for the Week ending December 4, 2010
  • During week 48, the overall influenza activity in Canada increased from the previous week particularly in some regions of the Prairies, Ontario and Quebec.
  • The proportion of positive influenza specimens reported during week 48 has doubled again this week with 225 specimens out of 2,728 (8.25%) testing positive. Of the positive tests, 46.2% specimens were reported as influenza A/H3N2 (BC, AB, MB, ON & QC), 49.4% as unsubtyped influenza A (AB, ON & QC), 2.2% as pandemic H1N1 2009 (ON) and 2.2% as influenza B (SK, ON & QC).
  • Both the number of peadiatric and adult hospitalizations with influenza reported through IMPACT and CNISP surveillance systems have increased during week 48 compared to the previous week.
Overall Influenza Summary ? Week 48 (November 28 to December 4, 2010)

In week 48, while four regions reported localized activity (MB, ON & QC), 13 regions reported sporadic activity (BC, AB, SK, ON & QC) and 39 regions presented no activity (See Activity level Map). Seven new ILI/influenza outbreaks were reported during week 48: two influenza A/H3N2 in other facilities in MB including one workplace, two influenza A unsubtyped in a long-term care facility in MB & QC as well as three school outbreak in SK & NS.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 48



</TD></TR><TR class=alignCenter><TD>

</TD><TD><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD>No Data </TD><TD>
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</TD></TR><TR class=alignCenter><TD>No Activity</TD><TD>
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</TD></TR><TR class=alignCenter><TD>Sporadic Activity</TD><TD>
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</TD></TR><TR><TD>Localized Activity</TD><TD>
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</TD></TR><TR><TD>Widespread Activity</TD><TD>
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</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 48, the national ILI consultation rates was 18.7 consultations per 1,000 patients visits which was similar to what was observed in the previous weeks and was within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (63.9 per 1,000 consultations) followed by people aged between 5 and 19 years (21.0 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 48 (8.25%, 225/2,728) continued to increase. This proportion was higher than what was usually observed at this time of the year but lower than during H1N1 2009 pandemic (see Tests table and Influenza tests graph). Of the 225 positive tests, 104 specimens were reported as influenza A/H3N2 (BC, AB, MB, ON & QC), 111 as unsubtyped influenza A (AB, ON & QC), five as pandemic H1N1 2009 (ON) and five as influenza B (SK, ON & QC). Although the majority of influenza virus detections to date this season were influenza A viruses (95% or 515/541) detections for influenza B viruses are also increasing. Since the beginning of the season, 96% of the subtyped positive influenza A specimens were for influenza A/H3N2.During week 48, 25% (6/24) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged over 65 years, while since August 29, 2010, the proportion was 38% (58/153) (see Tests detailed table). In week 48, the proportion of respiratory syncytial virus detections (RSV) (3.95%) increased slightly in the last weeks while low levels of parainfluenza (3.41%), adenovirus (2.80%) and human metapneumovirus (0.42%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>*Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (November 28 to December 4, 2010)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to December 4, 2010)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>0</TD><TD class=alignCenter>17</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>42</TD><TD class=alignCenter>0</TD><TD class=alignCenter>42</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>54</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>96</TD><TD class=alignCenter>0</TD><TD class=alignCenter>48</TD><TD class=alignCenter>5</TD><TD class=alignCenter>43</TD><TD class=alignCenter>3</TD><TD class=alignCenter>251</TD><TD class=alignCenter>0</TD><TD class=alignCenter>110</TD><TD class=alignCenter>8</TD><TD class=alignCenter>133</TD><TD class=alignCenter>15</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>75</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>67</TD><TD class=alignCenter>1</TD><TD class=alignCenter>172</TD><TD class=alignCenter>0</TD><TD class=alignCenter>27</TD><TD class=alignCenter>0</TD><TD class=alignCenter>145</TD><TD class=alignCenter>5</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>220</TD><TD class=alignCenter>0</TD><TD class=alignCenter>104</TD><TD class=alignCenter>5</TD><TD class=alignCenter>111</TD><TD class=alignCenter>5</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>219</TD><TD class=alignCenter>8</TD><TD class=alignCenter>287</TD><TD class=alignCenter>26</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(November 28 to December 4, 2010) (28/225)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(August 29, 2010 to December 4, 2010) (188/541)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>31</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>3</TD><TD class=alignCenter>3</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>1</TD><TD class=alignCenter>13</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>41</TD><TD class=alignCenter>1</TD><TD class=alignCenter>37</TD><TD class=alignCenter>3</TD><TD class=alignCenter>3</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>21</TD><TD class=alignCenter>3</TD><TD class=alignCenter>17</TD><TD class=alignCenter>1</TD><TD class=alignCenter>5</TD></TR><TR><TD>65+</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>67</TD><TD class=alignCenter>0</TD><TD class=alignCenter>58</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>27</TD><TD class=alignCenter>1</TD><TD class=alignCenter>24</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD><TD class=alignCenter>176</TD><TD class=alignCenter>5</TD><TD class=alignCenter>153</TD><TD class=alignCenter>18</TD><TD class=alignCenter>12</TD></TR></TBODY></TABLE>

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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w48_10/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 49

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 49

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>December 5 to December 11, 2010 (Week 49)


</TD></TR></TBODY></TABLE></B>

Posted 2010-12-17


Summary of FluWatch Findings for the Week ending December 11, 2010
  • During week 49, the overall influenza activity in Canada increased from the previous week, particularly in regions across the Prairies, Ontario and Quebec.
  • The proportion of positive influenza specimens reported during week 49 has increased over last week with 323 specimens out of 3,000 (10.8%) testing positive of which 96.6% are influenza A and 3.4% influenza B. Of the positive influenza A tests subtyped, 94% are influenza A/H3N2 and 6% are pandemic H1N1 2009.
  • Both the number of paediatric and adult hospitalizations with influenza reported through IMPACT and CNISP surveillance systems have increased during week 49 compared to the previous week.
Note: The last FluWatch report of 2010 will be published on December 24th for week 50. No report will be published on December 31st. The FluWatch report for weeks 51 and 52 (December 19th to January 1st) will be published on January 7th, 2011.
Overall Influenza Summary ? Week 49 (December 5 to December 11, 2010)

In week 49, one region in ON reported widespread influenza activity, seven regions reported localized activity (BC, AB, MB, ON & QC), 11 regions reported sporadic activity (AB, SK, MB, ON & QC) and 37 regions presented no activity (See Activity level Map). Eight new ILI/influenza outbreaks were reported during week 49: two influenza A (unsubtyped) in long-term care facilities (LTCF) in MB and QC, five ILI outbreaks in LTCF in AB(1) and ON(4), as well as a school outbreak of ILI in NB.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 49



</TD></TR><TR class=alignCenter><TD>

</TD><TD><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD>No Data </TD><TD>
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</TD></TR><TR class=alignCenter><TD>No Activity</TD><TD>
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</TD></TR><TR class=alignCenter><TD>Sporadic Activity</TD><TD>
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</TD></TR><TR><TD>Localized Activity</TD><TD>
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</TD></TR><TR><TD>Widespread Activity</TD><TD>
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</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 49, the national ILI consultation rate was 23.6 consultations per 1,000 patient visits which has increased from last week but still within the expected levels for this time of year (see ILI graph). Children between 5 and 19 years had the highest consultation rates (45.6 per 1,000 consultations) followed by children under 5 years of age (31.3 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 49 (10.8%, 323/3,000) continued to increase, and was higher than what is usually observed at this time of the year. Of the 323 positive tests, 79 specimens were reported as influenza A/H3N2 (BC, AB, SK, ON & QC), five as pandemic H1N1 2009 (AB, ON), 11 as influenza B (SK, ON & QC) and 228 as unsubtyped influenza A (BC, AB, SK, MB, ON & QC). Although the majority of influenza virus detections to date this season were influenza A viruses (96% or 826/863), detections for influenza B viruses are also increasing. Since the beginning of the season, 96% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 49, 58.6% (17/29) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged over 65 years, while since August 29, 2010, the proportion was 43.5% (91/209) (see Tests detailed table). In week 49, the proportion of respiratory syncytial virus detections (RSV) (5.40%) increased slightly in the last week while low levels of parainfluenza (2.86%) and adenovirus (3.42%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>*Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (December 5 to December 11, 2010)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to December 11, 2010)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>30</TD><TD class=alignCenter>0</TD><TD class=alignCenter>24</TD><TD class=alignCenter>1</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>57</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>57</TD><TD class=alignCenter>0</TD><TD class=alignCenter>111</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>58</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>128</TD><TD class=alignCenter>0</TD><TD class=alignCenter>65</TD><TD class=alignCenter>4</TD><TD class=alignCenter>59</TD><TD class=alignCenter>6</TD><TD class=alignCenter>379</TD><TD class=alignCenter>0</TD><TD class=alignCenter>175</TD><TD class=alignCenter>12</TD><TD class=alignCenter>192</TD><TD class=alignCenter>21</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>106</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>104</TD><TD class=alignCenter>3</TD><TD class=alignCenter>278</TD><TD class=alignCenter>0</TD><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>249</TD><TD class=alignCenter>8</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>312</TD><TD class=alignCenter>0</TD><TD class=alignCenter>79</TD><TD class=alignCenter>5</TD><TD class=alignCenter>228</TD><TD class=alignCenter>11</TD><TD class=alignCenter>826</TD><TD class=alignCenter>0</TD><TD class=alignCenter>298</TD><TD class=alignCenter>13</TD><TD class=alignCenter>515</TD><TD class=alignCenter>37</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(December 5 to December 11, 2010) (77/323)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(August 29, 2010 to December 11, 2010) (314/863)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>55</TD><TD class=alignCenter>2</TD><TD class=alignCenter>36</TD><TD class=alignCenter>17</TD><TD class=alignCenter>6</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>1</TD><TD class=alignCenter>14</TD><TD class=alignCenter>13</TD><TD class=alignCenter>2</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>64</TD><TD class=alignCenter>1</TD><TD class=alignCenter>44</TD><TD class=alignCenter>19</TD><TD class=alignCenter>4</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>39</TD><TD class=alignCenter>3</TD><TD class=alignCenter>24</TD><TD class=alignCenter>12</TD><TD class=alignCenter>5</TD></TR><TR><TD>65+</TD><TD class=alignCenter>27</TD><TD class=alignCenter>0</TD><TD class=alignCenter>17</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>110</TD><TD class=alignCenter>0</TD><TD class=alignCenter>91</TD><TD class=alignCenter>19</TD><TD class=alignCenter>0</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>76</TD><TD class=alignCenter>0</TD><TD class=alignCenter>29</TD><TD class=alignCenter>47</TD><TD class=alignCenter>1</TD><TD class=alignCenter>297</TD><TD class=alignCenter>7</TD><TD class=alignCenter>209</TD><TD class=alignCenter>81</TD><TD class=alignCenter>17</TD></TR></TBODY></TABLE>

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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 50

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 50

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>December 12 to December 18, 2010 (Week 50)


</TD></TR></TBODY></TABLE>
Posted 2010-12-24
</B>

Summary of FluWatch Findings for the Week ending December 18, 2010
  • During week 50, all influenza surveillance indicators continue to increase, particularly in regions across the Prairies, Ontario and Quebec.
  • The proportion of positive influenza specimens reported during week 50 has increased over last week with 565 specimens out of 3,577 (15.8%) testing positive of which 99% are influenza A and 1% influenza B. Of the positive influenza A tests subtyped, 91% are influenza A/H3N2

  • and 9% are pandemic H1N1 2009.
  • Worldwide, influenza activity is increasing in the northern hemisphere, in particular in the UK (England), with pandemic influenza A/H1N1 and B being the predominant circulating viruses. Outbreaks and severe cases, mainly in people aged <65 years, continue to be reported in the
    UK.
Note: This is the final FluWatch report of 2010. No report will be published on December 31<SUP>st </SUP>. The FluWatch
report for weeks 51 and 52 (December 19<SUP>th </SUP>to January 1<SUP>st </SUP>) will be published on January 7<SUP>th </SUP>, 2011.


Overall Influenza Summary ? Week 50 (December 12 to December 18, 2010)

In week 50, one region in ON reported widespread influenza activity, seven regions reported localized activity (BC, MB, & ON), 14 regions reported sporadic activity (NT, BC, AB, MB, ON & QC) and 34 regions presented no activity (See Activity level Map). Ten new ILI/influenza outbreaks were reported during week 50: 9 outbreaks of unsubtyped influenza A in ON (5 in long-term care facilities (LTCF), 4 in other facilities), and one outbreak of pandemic H1N1 2009 in a facility in BC.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 50



</TD></TR><TR class=alignCenter><TD class=alignCenter>

</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
leg_ccccff.gif
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
leg_6666ff.gif
</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2010-w50-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
Text Equivalent
ILI consultation rate
During week 50, the national ILI consultation rate was 24.5 consultations per 1,000 patient visits which has increased from last week but still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (69 per 1,000 consultations) followed by those between 5 and 19 years (59 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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-->Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 50 (15.8%, 565/3,577) continued to increase. Of the 565 positive tests, 153 specimens were reported as influenza A/H3N2 (BC, AB, SK, ON & QC), 15 as pandemic H1N1 2009 (BC, AB, ON & QC), 5 as influenza B (ON & QC) and 392 as unsubtyped influenza A (SK, MB, ON & QC). Although the majority of influenza virus detections to date this season were influenza A viruses (97% or 1386/1428), detections for influenza B viruses are also increasing. Since the beginning of the season, 91% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 50, 45% (41/91) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged over 65 years (see Tests detailed table). In week 50, the proportion of respiratory syncytial virus detections (RSV) (8%) increased slightly in the last week while low levels of parainfluenza (2.7%) and adenovirus (3.1%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>*Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (December 12 to December 18, 2010)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to December 18, 2010)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>23</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>6</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>44</TD><TD class=alignCenter>0</TD><TD class=alignCenter>37</TD><TD class=alignCenter>4</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>94</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>94</TD><TD class=alignCenter>0</TD><TD class=alignCenter>205</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>152</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>244</TD><TD class=alignCenter>0</TD><TD class=alignCenter>121</TD><TD class=alignCenter>9</TD><TD class=alignCenter>114</TD><TD class=alignCenter>1</TD><TD class=alignCenter>623</TD><TD class=alignCenter>0</TD><TD class=alignCenter>296</TD><TD class=alignCenter>21</TD><TD class=alignCenter>306</TD><TD class=alignCenter>22</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>203</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>1</TD><TD class=alignCenter>183</TD><TD class=alignCenter>4</TD><TD class=alignCenter>481</TD><TD class=alignCenter>0</TD><TD class=alignCenter>48</TD><TD class=alignCenter>1</TD><TD class=alignCenter>432</TD><TD class=alignCenter>12</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>560</TD><TD class=alignCenter>0</TD><TD class=alignCenter>153</TD><TD class=alignCenter>15</TD><TD class=alignCenter>392</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1386</TD><TD class=alignCenter>0</TD><TD class=alignCenter>453</TD><TD class=alignCenter>28</TD><TD class=alignCenter>905</TD><TD class=alignCenter>42</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(December 12 to December 18, 2010) (106/565)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Dec. 18, 2010)
(475/1428)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>22</TD><TD class=alignCenter>1</TD><TD class=alignCenter>20</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>82</TD><TD class=alignCenter>4</TD><TD class=alignCenter>60</TD><TD class=alignCenter>18</TD><TD class=alignCenter>7</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>44</TD><TD class=alignCenter>2</TD><TD class=alignCenter>31</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>82</TD><TD class=alignCenter>3</TD><TD class=alignCenter>60</TD><TD class=alignCenter>19</TD><TD class=alignCenter>4</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>17</TD><TD class=alignCenter>2</TD><TD class=alignCenter>11</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>62</TD><TD class=alignCenter>6</TD><TD class=alignCenter>40</TD><TD class=alignCenter>16</TD><TD class=alignCenter>5</TD></TR><TR><TD>65+</TD><TD class=alignCenter>44</TD><TD class=alignCenter>0</TD><TD class=alignCenter>41</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>183</TD><TD class=alignCenter>0</TD><TD class=alignCenter>163</TD><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>105</TD><TD class=alignCenter>4</TD><TD class=alignCenter>91</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>457</TD><TD class=alignCenter>15</TD><TD class=alignCenter>356</TD><TD class=alignCenter>86</TD><TD class=alignCenter>18</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 50

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Week 50

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>December 19 to January 1, 2010 (Weeks 51 & 52)


</TD></TR></TBODY></TABLE></B>

Posted 2011-01-07


Summary of FluWatch Findings for the Week ending January 1, 2011
  • During weeks 51 and 52 the overall influenza activity in Canada continued to increase across the country.
  • Twenty five percent of specimens tested were positive for influenza during the two-week period, an increase from previous weeks. The ILI consultation rate also increased, but was within the expected range.
  • Influenza A was identified in 98.3% of positive influenza tests, and among those which were subtyped, 94% were influenza A/H3N2 and 6% were pandemic H1N1 2009.
  • Both the number of paediatric and adult hospitalizations with influenza reported through IMPACT and CNISP surveillance systems increased during weeks 51 and 52 compared to the previous week.
Overall Influenza Summary ? Weeks 51 & 52 (December 19, 2010 to January 1, 2011)

In week 52, one region in ON reported widespread influenza activity, 8 regions reported localized activity (MB, ON & QC), 22 regions reported sporadic activity (BC, AB, SK, MB, ON, QC, NB, NS, PE & NT) and 24 regions presented no activity (See Activity level Map). Compared to week 50, 12 regions reported increased influenza activity over weeks 51 and 52, 1 region reported decreased activity, and 15 regions maintained a stable level of influenza activity (sporadic or higher). During weeks 51 and 52, 56 new ILI/influenza outbreaks were reported: 37 in long-term care facilities (LTCF) in AB(1), MB(11), ON(17), QC(7) and NS(1); 8 outbreaks in hospitals in MB(2) and ON(6); and 11 outbreaks in other facilities/settings in ON.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 52



</TD></TR><TR class=alignCenter><TD class=alignCenter>

</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 51, the national ILI consultation rate was 27.5 consultations per 1,000 patient visits, and it continued to increase during week 52 to 49.8 consultations per 1,000 patient visits. This is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (63.3 per 1,000 consultations in week 52) followed by children between 5 and 19 years (54.3 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 51 was 23.1% and during week 52 was 24.6%. The proportion of positive tests has increased since week 45, and was higher than what is usually observed at this time of the year, reflecting an earlier start to the influenza season. Of the 2300 positive tests reported during weeks 51 and 52, 658 specimens were reported as influenza A/H3N2, 40 as pandemic H1N1 2009 (BC, AB, ON, QC, PE), 40 as influenza B (BC, AB, ON & QC) and 1561 as unsubtyped influenza A (all provinces except NS, PE, NL). In addition, one non-pandemic A/H1N1 specimen was detected during week 52 in BC. Although the majority of influenza virus detections to date this season were influenza A viruses (97.8% or 3657/3739), detections for influenza B viruses continued to increase. Since the beginning of the season, 94.2% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 52, 57.3% (86/150) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged over 65 years, while since August 29, 2010, the proportion was 48.0% (417/868) (see Tests detailed table). In weeks 51 and 52, the proportion of respiratory syncytial virus detections (RSV) increased slightly to 11.1% of specimens tested while low levels of parainfluenza (2.7%) and adenovirus (2.2%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>*Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (December 19 to January 1, 2010)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to January 1, 2010)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue" scope=col>A (NS)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>20</TD><TD class=alignCenter>1</TD><TD class=alignCenter>7</TD><TD class=alignCenter>3</TD><TD class=alignCenter>9</TD><TD class=alignCenter>1</TD><TD class=alignCenter>43</TD><TD class=alignCenter>0</TD><TD class=alignCenter>22</TD><TD class=alignCenter>5</TD><TD class=alignCenter>15</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>66</TD><TD class=alignCenter>0</TD><TD class=alignCenter>55</TD><TD class=alignCenter>6</TD><TD class=alignCenter>5</TD><TD class=alignCenter>3</TD><TD class=alignCenter>121</TD><TD class=alignCenter>0</TD><TD class=alignCenter>95</TD><TD class=alignCenter>10</TD><TD class=alignCenter>16</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>172</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>172</TD><TD class=alignCenter>0</TD><TD class=alignCenter>377</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>324</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>999</TD><TD class=alignCenter>0</TD><TD class=alignCenter>502</TD><TD class=alignCenter>26</TD><TD class=alignCenter>471</TD><TD class=alignCenter>28</TD><TD class=alignCenter>1622</TD><TD class=alignCenter>0</TD><TD class=alignCenter>798</TD><TD class=alignCenter>47</TD><TD class=alignCenter>777</TD><TD class=alignCenter>50</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>994</TD><TD class=alignCenter>0</TD><TD class=alignCenter>91</TD><TD class=alignCenter>4</TD><TD class=alignCenter>899</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1475</TD><TD class=alignCenter>0</TD><TD class=alignCenter>139</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1331</TD><TD class=alignCenter>20</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>2260</TD><TD class=alignCenter>1</TD><TD class=alignCenter>658</TD><TD class=alignCenter>40</TD><TD class=alignCenter>1561</TD><TD class=alignCenter>40</TD><TD class=alignCenter>3657</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1114</TD><TD class=alignCenter>68</TD><TD class=alignCenter>2474</TD><TD class=alignCenter>82</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(December 26 to January 1, 2010)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Jan. 1, 2010)

</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>29</TD><TD class=alignCenter>3</TD><TD class=alignCenter>22</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>182</TD><TD class=alignCenter>12</TD><TD class=alignCenter>139</TD><TD class=alignCenter>31</TD><TD class=alignCenter>10</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>72</TD><TD class=alignCenter>4</TD><TD class=alignCenter>48</TD><TD class=alignCenter>20</TD><TD class=alignCenter>7</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>22</TD><TD class=alignCenter>5</TD><TD class=alignCenter>12</TD><TD class=alignCenter>5</TD><TD class=alignCenter>3</TD><TD class=alignCenter>158</TD><TD class=alignCenter>12</TD><TD class=alignCenter>102</TD><TD class=alignCenter>44</TD><TD class=alignCenter>9</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>24</TD><TD class=alignCenter>4</TD><TD class=alignCenter>16</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>129</TD><TD class=alignCenter>15</TD><TD class=alignCenter>92</TD><TD class=alignCenter>22</TD><TD class=alignCenter>6</TD></TR><TR><TD>65+</TD><TD class=alignCenter>116</TD><TD class=alignCenter>1</TD><TD class=alignCenter>86</TD><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>481</TD><TD class=alignCenter>1</TD><TD class=alignCenter>417</TD><TD class=alignCenter>63</TD><TD class=alignCenter>2</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>72</TD><TD class=alignCenter>0</TD><TD class=alignCenter>70</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>209</TD><TD class=alignCenter>14</TD><TD class=alignCenter>150</TD><TD class=alignCenter>45</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1094</TD><TD class=alignCenter>44</TD><TD class=alignCenter>868</TD><TD class=alignCenter>182</TD><TD class=alignCenter>34</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Paediatric Influenza Hospitalizations and Deaths
In weeks 51 and 52, 81 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 2 from BC, 2 from AB, 1 from SK, 8 from MB, 25 from ON, and 43 from QC. This number is increased compared to the previous 2 week period (weeks 49 & 50) in which 37 paediatric hospitalizations were reported. No deaths were reported in weeks 51 and 52. This season, one death in a child aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 has been reported. Since the beginning of the season, 154 hospitalizations have been reported from BC, AB, SK, MB, ON & QC; 19 (12.3%) as influenza A/H3N2, 4 (2.6%) pandemic H1N1 2009, 124 (80.5%) as unsubytped influenza A, and 7 (4.5%) type B. The distribution of cases to date by age group was as follows: 16.9% among 0-5 month olds; 28.6% among 6-23 month olds; 27.9% among the 2-4 year-olds; 20.1% among 5-9 year-olds; and 6.5% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During weeks 51 and 52, 73 and 93 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP) from 24 and 27 sites, respectively. This number is increased compared to the previous 2 week period (weeks 49 & 50) when 46 adult hospitalizations were reported. Of the total 166 new hospitalized cases reported between December 19, 2010 and January 1, 2011, 106 (63.9%) tested positive for unsubtyped influenza A, 53 (32.0%) as influenza A/H3N2, 4 (2.4%) as pandemic H1N1 2009, and 3 (1.8%) as influenza B. Since the beginning of the season, 254 hospitalized cases have been reported: 72 A/H3N2, 9 pandemic H1N1, 170 influenza A unsubtyped, and 3 influenza B, from BC, AB, MB, ON and QC. 180 of the 254 (70.9%) cases were aged 65 years or older and 113 (44.5%) were males.

Among the ten provinces and territories conducting severe outcomes surveillance, since the beginning of the season four deaths have been reported among laboratory-confirmed influenza cases. There were two deaths with influenza A/H3N2 in MB in persons aged between 20 and 44 years and between 45 and 64 years (reported on week 47 and 48, respectively) and two deaths with influenza A among people aged 65 years of age or older in ON (reported on week 40 and 45, respectively). In addition during weeks 51 and 52, Ontario hospitals participating in CNISP reported 4 deaths (2 in each week) with laboratory-confirmed influenza A (unsubtyped): one in a person between 65 and 79 years old, and 3 persons older than 80 years of age.

Antigenic Characterization
Between September 1 and January 6, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 94 influenza viruses that were received from provincial laboratories: 71 A/H3N2 from BC, AB, SK, MB, ON & QC, 8 pandemic H1N1 2009 from BC, AB & ON, and 15 B viruses from BC, AB, SK, ON & QC. All 71 influenza A/H3N2 viruses characterized were antigenically related to A/Perth/6/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. The eight pandemic H1N1 2009 viruses characterized were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. Of the 15 influenza B viruses characterized, 11 were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08.

Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 90 influenza A/H3N2 and eight pandemic H1N1 isolates for amantadine resistance and found that 89 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 8 influenza A/H1N1 viruses were resistant to amantadine. 84 influenza isolates (61 A/H3N2, 8 pandemic H1N1 and 15 B) were tested for oseltamivir resistance and it was found that all isolates were sensitive to oseltamivir. 84 influenza isolates (61 A/H3N2, 8 pandemic H1N1 and 15 B) were tested for zanamivir resistance and it was found that all isolates were sensitive to zanamivir.

More..
http://www.phac-aspc.gc.ca/fluwatch/10-11/w52_10/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season - Weeks 51 & 52

Re: Canada FluWatch Weekly Reports 2010-2011 Season - Weeks 51 & 52

Overall Influenza Summary ? Week 1 (January 2 to 8, 2011)
In week 01, two regions (in ON and QC) reported widespread influenza activity, 13 regions reported localized activity (in BC, AB, MB, ON & QC), 24 regions reported sporadic activity (in all provinces and territories except YK and NL) and 16 regions presented no activity (See Activity level Map). Compared to the previous 2 weeks (weeks 51 & 52), 19 regions reported increased influenza activity, 2 regions reported decreased activity, and 15 regions maintained a stable level of influenza activity (sporadic or higher). During week 01, 37 new ILI/influenza outbreaks were reported: 25 in long-term care facilities (LTCF) in MB(3), ON(12), and QC(10); 3 outbreaks in hospitals in AB(1) and ON(2); 8 outbreaks in other facilities/settings in AB(1), ON(6) and PE(1), and a school outbreak in BC.

...

ILI consultation rate

During week 01, the national ILI consultation rate was 47.2 consultations per 1,000 patient visits, which is down slightly compared to 51.4 per 1,000 in week 52. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (100.7 per 1,000 consultations in week 01) followed by children between 5 and 19 years (90.9 per 1,000).

...

Laboratory Surveillance Summary

The proportion of tests that were positive for influenza during week 01 was 25.5%. The proportion of positive tests has increased since week 45, and now appears to be approaching the peak. Of the 1879 positive tests reported during week 01, 473 specimens were reported as influenza A/H3N2, 44 as pandemic H1N1 2009 (AB, MB, ON, QC, NB, PE), 36 as influenza B (AB, ON & QC) and 1326 as unsubtyped influenza A. Although the majority of influenza virus detections to date this season were influenza A viruses (97.9% or 5540/5661), detections for influenza B viruses continued to increase. Since the beginning of the season, 93.2% of the subtyped positive influenza A specimens were influenza A/H3N2.During week 01, 67.4% (149/221) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 51.9% (700/1348) (see Tests detailed table). In week 01, the proportion of respiratory syncytial virus detections (RSV) decreased slightly to 9.5% of specimens tested while low levels of parainfluenza (2.7%) and adenovirus (1.7%) continue to be reported (see Respiratory viruses graph).

...

Paediatric Influenza Hospitalizations and Deaths
In week 01, 23 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 1 from BC, 1 from AB, 13 from ON, and 8 from QC. This number decreased compared to weeks 51 & 52 in which 29 and 68 paediatric hospitalizations were reported, respectively (note that these numbers may fluctuate because of the delays in reporting). Since the beginning of the season, 193 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON & QC; 36 (18.6%) as influenza A/H3N2, 6 (3.1%) pandemic H1N1 2009, 144 (74.6%) as unsubytped influenza A, and 7 (3.6%) type B. The distribution of cases to date by age group was as follows: 15.5% among 0-5 month olds; 27.5% among 6-23 month olds; 32.1% among the 2-4 year-olds; 17.1% among 5-9 year-olds; and 7.8% among children 10-16 years old. This season, one death in a child aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 has been reported.

Adult Influenza Hospitalizations and Deaths
During week 01, 100 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP) from 29 sites. This number is decreased compared to the previous week (week 52) when 115 adult hospitalizations were reported (note that these numbers may fluctuate because of the delays in reporting). New hospitalizations were reported from CNISP sites in AB, MB, ON & QC. Of these 100 hospitalized cases 89 (89%) tested positive for unsubtyped influenza A, 2 as influenza A/H3N2, 4 as pandemic H1N1 2009, and 5 as influenza B. Since the beginning of the season, 411 hospitalized cases have been reported: 95 A/H3N2, 14 pandemic A/H1N1, 294 influenza A unsubtyped, and 8 influenza B, from BC, AB, MB, ON and QC. 299 of the 411 (72.7%) cases were aged 65 years or older and 180 (43.8%) were males.

Among the ten provinces and territories conducting severe outcomes surveillance, since the beginning of the season 25 deaths have been reported among laboratory-confirmed influenza cases, 3 in MB and 22 in ON. Among these 25 fatal cases, influenza A/H3N2 was identified in 52% (13/25), and unsubtyped influenza A in 40% (10/25). Pandemic H1N1 2009 was identified in 2 cases (8%). Seventy-two percent (18/25) of these fatal cases were among persons 65 years of age or older, and another 20% (5/25) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

...

full report at; http://www.phac-aspc.gc.ca/fluwatch/10-11/w01_11/pdf/fw2011-01-eng.pdf
 
Canada FluWatch Weekly Reports 2010-2011 Season Week 2 - 50 deaths total - 5 from MB and 45 from ON

Canada FluWatch Weekly Reports 2010-2011 Season Week 2 - 50 deaths total - 5 from MB and 45 from ON

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>January 9 to January 15, 2011 (Week 2)


</TD></TR></TBODY></TABLE></B>

Posted 2011-01-21


Summary of FluWatch Findings for the Week ending January 15, 2011
  • During week 02 several indicators of influenza activity have decreased across the country: the number of regions reporting widespread and localized influenza activity, the number of outbreaks, the percentage of specimens testing positive for influenza, the ILI consultation rate and the number of paediatric and adult hospitalizations.
  • Since the beginning of the season, 91.1% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 02, detections of pandemic H1N1 2009 increased to 15.5% of all subtyped influenza A specimens, compared to 8.5% in week 01.
Overall Influenza Summary ? Week 2 (January 9 to 15, 2011)

In week 02, one region in ON reported widespread influenza activity, 11 regions reported localized activity (in AB(1), MB(1), ON(5), QC(3) & PE(1)), 25 regions reported sporadic activity (in all provinces and territories except YK, NL and PE) and 16 regions presented no activity. No data was available for NU at time of report. (See Activity level Map). Compared to the previous 2 weeks (weeks 52 & 01), 11 regions reported increased influenza activity, one region reported decreased activity, and 19 regions maintained a stable level of influenza activity (sporadic or higher). During week 02, 27 new ILI/influenza outbreaks were reported: 22 in long-term care facilities (LTCF) in AB(1), MB(1), ON(5), QC(14) and NS(1); 3 outbreaks in hospitals in ON; one outbreaks in other facilities/settings in PE, and a school outbreak in NS.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 2



</TD></TR><TR class=alignCenter><TD class=alignCenter>

</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
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</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.

</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 02, the national ILI consultation rate was 28.1 consultations per 1,000 patient visits, which is down compared to 48.2 per 1,000 in week 01. This rate is still within the expected levels for this time of year (see ILI graph). Children between 5 and 19 years had the highest consultation rates (55.3 per 1,000 consultations in week 02) followed by children under 5 years of age (41.6 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 02 was 23.1%. The proportion of positive tests increased from week 45 to 52, and now appears to have peaked. Of the 1648 positive tests reported during week 02, 404 specimens were reported as influenza A/H3N2, 74 as pandemic H1N1 2009 (BC, AB, ON, QC, NL, PE), 29 as influenza B (BC, AB, SK, ON & QC) and 1141 as unsubtyped influenza A. The majority of influenza virus detections to date this season were influenza A viruses (97.9% or 6941/6796). Since the beginning of the season, 91.1% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 02, detections of pandemic H1N1 2009 increased to 15.5% of all subtyped influenza A specimens, compared to 8.5% in week 01. During week 02, 51.8% (73/141) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 51.7% (931/1801) (see Tests detailed table). In week 02, the proportion of respiratory syncytial virus detections (RSV) was stable at 9.6% of specimens tested while low levels of parainfluenza (2.2%) and adenovirus (1.6%) continue to be reported. While overall testing continued to increase for respiratory viruses in week 02, the proportion of positive tests is in decline in most regions (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (January 9 to January 15, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to January 15, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>24</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>13</TD><TD class=alignCenter>5</TD><TD class=alignCenter>5</TD><TD class=alignCenter>86</TD><TD class=alignCenter>0</TD><TD class=alignCenter>31</TD><TD class=alignCenter>19</TD><TD class=alignCenter>36</TD><TD class=alignCenter>9</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>57</TD><TD class=alignCenter>0</TD><TD class=alignCenter>37</TD><TD class=alignCenter>9</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2</TD><TD class=alignCenter>233</TD><TD class=alignCenter>0</TD><TD class=alignCenter>185</TD><TD class=alignCenter>29</TD><TD class=alignCenter>19</TD><TD class=alignCenter>10</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>27</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>5</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>30</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>27</TD><TD class=alignCenter>0</TD><TD class=alignCenter>416</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>359</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>849</TD><TD class=alignCenter>0</TD><TD class=alignCenter>285</TD><TD class=alignCenter>48</TD><TD class=alignCenter>516</TD><TD class=alignCenter>14</TD><TD class=alignCenter>3550</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1418</TD><TD class=alignCenter>124</TD><TD class=alignCenter>2008</TD><TD class=alignCenter>93</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>644</TD><TD class=alignCenter>0</TD><TD class=alignCenter>69</TD><TD class=alignCenter>2</TD><TD class=alignCenter>573</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2461</TD><TD class=alignCenter>0</TD><TD class=alignCenter>209</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2245</TD><TD class=alignCenter>28</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1619</TD><TD class=alignCenter>0</TD><TD class=alignCenter>404</TD><TD class=alignCenter>74</TD><TD class=alignCenter>1141</TD><TD class=alignCenter>29</TD><TD class=alignCenter>6796</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1914</TD><TD class=alignCenter>187</TD><TD class=alignCenter>4695</TD><TD class=alignCenter>145</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(January 9 to January 15, 2011)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Jan. 15, 2011)

</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>49</TD><TD class=alignCenter>6</TD><TD class=alignCenter>32</TD><TD class=alignCenter>11</TD><TD class=alignCenter>4</TD><TD class=alignCenter>371</TD><TD class=alignCenter>32</TD><TD class=alignCenter>268</TD><TD class=alignCenter>71</TD><TD class=alignCenter>16</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>8</TD><TD class=alignCenter>4</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>148</TD><TD class=alignCenter>13</TD><TD class=alignCenter>76</TD><TD class=alignCenter>59</TD><TD class=alignCenter>9</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>31</TD><TD class=alignCenter>7</TD><TD class=alignCenter>14</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>350</TD><TD class=alignCenter>50</TD><TD class=alignCenter>203</TD><TD class=alignCenter>97</TD><TD class=alignCenter>14</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>37</TD><TD class=alignCenter>14</TD><TD class=alignCenter>12</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2</TD><TD class=alignCenter>294</TD><TD class=alignCenter>42</TD><TD class=alignCenter>184</TD><TD class=alignCenter>68</TD><TD class=alignCenter>12</TD></TR><TR><TD>65+</TD><TD class=alignCenter>105</TD><TD class=alignCenter>2</TD><TD class=alignCenter>73</TD><TD class=alignCenter>30</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1091</TD><TD class=alignCenter>10</TD><TD class=alignCenter>931</TD><TD class=alignCenter>150</TD><TD class=alignCenter>12</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>11</TD><TD class=alignCenter>3</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>145</TD><TD class=alignCenter>3</TD><TD class=alignCenter>139</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>241</TD><TD class=alignCenter>36</TD><TD class=alignCenter>141</TD><TD class=alignCenter>64</TD><TD class=alignCenter>12</TD><TD class=alignCenter>2399</TD><TD class=alignCenter>150</TD><TD class=alignCenter>1801</TD><TD class=alignCenter>448</TD><TD class=alignCenter>63</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Paediatric Influenza Hospitalizations and Deaths
In week 02 (ending Jan. 15, 2011), 19 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 14 from ON, 2 from QC, 2 from AB, and one from MB. This number decreased compared to the previous week (week 01) in which 27 paediatric hospitalizations were reported (note that these numbers may fluctuate because of the delays in reporting). Since the beginning of the season, 216 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON & QC; 37 (17.1%) as influenza A/H3N2, 7 (3.2%) pandemic H1N1 2009, 163 (75.5%) as unsubytped influenza A, and 9 (4.2%) influenza B. The distribution of cases to date by age group was as follows: 16.2% among 0-5 month olds; 28.7% among 6-23 month olds; 29.6% among the 2-4 year-olds; 16.7% among 5-9 year-olds; and 8.8% among children 10-16 years old. This season, one death in a child aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in ON in week 48.

Adult Influenza Hospitalizations and Deaths
During week 02, 77 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP) from 29 sites. This number decreased for the second week in a row, compared with 132 adult hospitalizations reported in week 52 and 106 reported in week 01 (note that these numbers may fluctuate because of the delays in reporting). New hospitalizations were reported from CNISP sites in BC, ON & QC. Of these 77 hospitalized cases 54 (70.1%) tested positive for unsubtyped influenza A, 15 (19.5%) as influenza A/H3N2, 7 (9.1%) as pandemic H1N1 2009, and 1 (1.3%) as influenza B. Since the beginning of the season, 487 hospitalized cases have been reported: 110 (22.6%) A/H3N2, 21 (4.3%) pandemic H1N1 2009, 347 (71.3%) influenza A unsubtyped, and 9 (1.8%) influenza B, from BC, AB, MB, ON and QC. 349 of the 487 (71.7%) cases were aged 65 years or older and 214 (43.9%) were males.

Among the ten provinces and territories conducting severe outcomes surveillance, since the beginning of the season 50 deaths have been reported with laboratory-confirmed influenza. Among the 50 fatal cases, 5 were reported from MB and 45 from ON; influenza A/H3N2 was identified in 54% (27/50), unsubtyped influenza A in 40% (20/50), and pandemic H1N1 2009 in 3 cases (6%). Seventy-two percent (36/50) of these fatal cases were among persons 65 years of age or older, and another 20% (10/50) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

...
http://www.phac-aspc.gc.ca/fluwatch/10-11/w02_11/index-eng.php
 
Canada FluWatch Weekly Reports 2010-2011 Season Week 3: 67 deaths total - 5 from MB and 62 from ON

Canada FluWatch Weekly Reports 2010-2011 Season Week 3: 67 deaths total - 5 from MB and 62 from ON

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>January 16 to January 22, 2011 (Week 03)

</TD></TR></TBODY></TABLE>

Posted 2011-01-28
Summary of FluWatch Findings for the Week ending January 22, 2011
  • Overall influenza detections appear to have peaked, with most regions across the country now showing a decline in the percentage of positive influenza detections, except BC and the Atlantic provinces. Paediatric and adult hospitalizations have decreased this week, however, some indicators have increased including the number of regions reporting widespread and localized influenza/ILI activity, the number of outbreaks, and the ILI consultation rate.
  • Since the beginning of the season, 89.5% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 03, detections of pandemic H1N1 2009 increased slightly to 16.9% of all subtyped influenza A specimens, compared to 15.5% in week 02. The overall proportion of positive tests for RSV has increased from 9.6% to 12.5% in week 03.

Overall Influenza Summary ? Week 3 (January 16 to 22, 2011)

In week 03, 4 regions (in AB(1), ON(1) and QC(2)) reported widespread influenza activity, 16 regions reported localized activity (in AB(1), SK(2), MB(1), ON(5), QC(4), NS(1), NB(1) & PE(1)), 24 regions reported sporadic activity (in all provinces and territories except QC, YK and PE) and 12 regions presented no activity. (See Activity level Map). Compared to the previous 2 weeks (weeks 01 & 02), 14 regions reported increased influenza activity, two regions reported decreased activity, and 20 regions maintained a stable level of influenza activity (sporadic or higher). During week 03, 36 new ILI/influenza outbreaks were reported: 24 in long-term care facilities (LTCF) in AB(3), MB(1), ON(5), QC(15) and PE(1); 5 outbreaks in hospitals in AB(2) and ON(3); and 7 school outbreaks in AB(1), SK(3), NB(2) and NS(1).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 3


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
leg_ccccff.gif
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 03, the national ILI consultation rate was 36.1 consultations per 1,000 patient visits, which is up compared to 28.6 per 1,000 in week 02. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (100.5 per 1,000 consultations in week 02) followed by children between 5 and 19 years (52.3 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 03 was 20.8%. The proportion of positive tests increased from week 45 to 52, and now appears to have peaked. Of the 1370 positive tests reported during week 03, 423 specimens were reported as influenza A/H3N2, 86 as pandemic H1N1 2009 (BC, AB, ON, QC, NS, PE), 46 as influenza B (BC, AB, SK, ON & QC) and 815 as unsubtyped influenza A. The majority of influenza virus detections to date this season were influenza A viruses (97.7% or 8123/8314). Since the beginning of the season, 89.5% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 03, detections of pandemic H1N1 2009 represented 16.9% of all subtyped influenza A specimens, a slight increase from 15.5% in week 02. During week 03, 34.8% (23/66) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 50.7% (960/1895) (see Tests detailed table). In week 03, the proportion of positive tests for respiratory syncytial virus detections (RSV) increased slightly from at 9.6% to 12.5% of specimens tested while low levels of parainfluenza (2.6%) and adenovirus (1.4%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (January 16 to January 22, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to January 22, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>33</TD><TD class=alignCenter>0</TD><TD class=alignCenter>13</TD><TD class=alignCenter>12</TD><TD class=alignCenter>8</TD><TD class=alignCenter>4</TD><TD class=alignCenter>119</TD><TD class=alignCenter>0</TD><TD class=alignCenter>44</TD><TD class=alignCenter>31</TD><TD class=alignCenter>44</TD><TD class=alignCenter>13</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>83</TD><TD class=alignCenter>0</TD><TD class=alignCenter>62</TD><TD class=alignCenter>16</TD><TD class=alignCenter>5</TD><TD class=alignCenter>12</TD><TD class=alignCenter>319</TD><TD class=alignCenter>0</TD><TD class=alignCenter>259</TD><TD class=alignCenter>47</TD><TD class=alignCenter>13</TD><TD class=alignCenter>22</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1</TD><TD class=alignCenter>35</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>33</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>33</TD><TD class=alignCenter>0</TD><TD class=alignCenter>449</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>392</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>613</TD><TD class=alignCenter>0</TD><TD class=alignCenter>275</TD><TD class=alignCenter>52</TD><TD class=alignCenter>286</TD><TD class=alignCenter>21</TD><TD class=alignCenter>4163</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1693</TD><TD class=alignCenter>176</TD><TD class=alignCenter>2294</TD><TD class=alignCenter>114</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>538</TD><TD class=alignCenter>0</TD><TD class=alignCenter>61</TD><TD class=alignCenter>4</TD><TD class=alignCenter>473</TD><TD class=alignCenter>8</TD><TD class=alignCenter>2999</TD><TD class=alignCenter>0</TD><TD class=alignCenter>270</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2718</TD><TD class=alignCenter>36</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1324</TD><TD class=alignCenter>0</TD><TD class=alignCenter>423</TD><TD class=alignCenter>86</TD><TD class=alignCenter>815</TD><TD class=alignCenter>46</TD><TD class=alignCenter>8123</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2349</TD><TD class=alignCenter>275</TD><TD class=alignCenter>5499</TD><TD class=alignCenter>191</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(January 16 to January 22, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Jan. 22, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>21</TD><TD class=alignCenter>1</TD><TD class=alignCenter>12</TD><TD class=alignCenter>8</TD><TD class=alignCenter>2</TD><TD class=alignCenter>405</TD><TD class=alignCenter>37</TD><TD class=alignCenter>284</TD><TD class=alignCenter>84</TD><TD class=alignCenter>18</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>25</TD><TD class=alignCenter>7</TD><TD class=alignCenter>15</TD><TD class=alignCenter>3</TD><TD class=alignCenter>8</TD><TD class=alignCenter>185</TD><TD class=alignCenter>23</TD><TD class=alignCenter>94</TD><TD class=alignCenter>68</TD><TD class=alignCenter>19</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>27</TD><TD class=alignCenter>10</TD><TD class=alignCenter>9</TD><TD class=alignCenter>8</TD><TD class=alignCenter>2</TD><TD class=alignCenter>391</TD><TD class=alignCenter>66</TD><TD class=alignCenter>220</TD><TD class=alignCenter>105</TD><TD class=alignCenter>16</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>17</TD><TD class=alignCenter>5</TD><TD class=alignCenter>7</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1</TD><TD class=alignCenter>318</TD><TD class=alignCenter>48</TD><TD class=alignCenter>198</TD><TD class=alignCenter>72</TD><TD class=alignCenter>13</TD></TR><TR><TD>65+</TD><TD class=alignCenter>27</TD><TD class=alignCenter>2</TD><TD class=alignCenter>23</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1128</TD><TD class=alignCenter>12</TD><TD class=alignCenter>960</TD><TD class=alignCenter>156</TD><TD class=alignCenter>14</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>145</TD><TD class=alignCenter>3</TD><TD class=alignCenter>139</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>117</TD><TD class=alignCenter>25</TD><TD class=alignCenter>66</TD><TD class=alignCenter>26</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2572</TD><TD class=alignCenter>189</TD><TD class=alignCenter>1895</TD><TD class=alignCenter>488</TD><TD class=alignCenter>80</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 03 (ending Jan. 22, 2011), 24 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 12 from ON, and 12 from QC. This number decreased compared to the previous week (week 02) in which 30 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). A new paediatric death was reported for week 04 in ON, of a child between 10 and 16 years old with unsubtyped influenza A who also had an underlying conditioin. This is the second paediatric death reported by IMPACT this season, the first being a child between 6 months and 23 months of age, who tested positive for pandemic H1N1 2009 in ON in week 48.

Since the beginning of the season, 258 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON & QC; 48 (18.6%) as influenza A/H3N2, 7 (2.7%) pandemic H1N1 2009, 191 (74.0%) as unsubytped influenza A, and 12 (4.7%) influenza B. The distribution of cases to date by age group was as follows: 18.6% among 0-5 month olds; 28.3% among 6-23 month olds; 28.7% among the 2-4 year-olds; 15.5% among 5-9 year-olds; and 8.9% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week three (week ending Jan.22, 2011) 51 new laboratory-confirmed influenza- adult (16 years of age and older) hospitalizations were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number decreased for the second week in a row, compared to 86 adult hospitalizations in week 02 and 124 in week 01 (note that numbers may fluctuate because of the delays in reporting). Of the total 51 new hospitalized cases reported between January 16th, 2011 and January 22nd, 2011, 40 (78.40%) tested positive for unsubtyped influenza A, 6 (11.8%) as influenza A/H3N2, 4 (7.8%) as pandemic H1N1 2009, and 1 (2.0) as influenza B. Since the beginning of the season, 538 hospitalized cases have been reported: 116 (21.6%) A/H3N2, 25 (4.6%) pandemic H1N1, 387 (71.9%) influenza A unsubtyped, and 10 (1.9%) influenza B, from BC, AB, MB, ON and QC. To-date, 382 of the 538 (71.0%) cases were aged 65 years or older and 230 (42.8%) were males.

Ten provinces and territories currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 03, ON reported 5 deaths, all in adults, 3 with A/H3N2 and 2 with unsubtyped influenza A (note that numbers may fluctuate because of the delays in reporting). Among the 67 fatal cases currently reported since the beginning of the influenza season, 5 deaths were reported from MB and 62 from ON; influenza A/H3N2 was identified in 60% (40/67), unsubtyped influenza A in 34% (23/67), pandemic H1N1 2009 in 3 cases (4.5%), and influenza B in one case (1.5%). Seventy-three percent (49/67) of these fatal cases were among persons 65 years of age or older, and another 16% (11/67) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

...
http://origin.phac-aspc.gc.ca/fluwatch/10-11/w03_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 4 - 84 deaths total: 5 from MB and 79 from ON

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 4 - 84 deaths total: 5 from MB and 79 from ON

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>January 23 to January 29, 2011 (Week 04)</H1></TD></TR></TBODY></TABLE>

Posted 2011-02-04


Overall Influenza Summary ? Week 4 (January 23 to 29, 2011)

In week 04, one region in QC reported widespread influenza activity, 14 regions reported localized activity (in SK(2), MB(1), ON(6), QC(2), NS(1), & NB(2)), 30 regions reported sporadic activity (in all provinces and territories except YK) and 11 regions presented no activity. (See Activity level Map). Compared to the previous 2 weeks (weeks 02 & 03), 13 regions reported increased influenza activity, 5 regions reported decreased activity, and 24 regions maintained a stable level of influenza activity (sporadic or higher). During week 04, 28 new ILI/influenza outbreaks were reported: 18 in long-term care facilities (LTCF) in SK(1), MB(1), ON(5), QC(8), NB (1) and NS(2); and 10 school outbreaks in SK(1), NB(5) and NS(4).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 4


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
leg_ccccff.gif
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 04, the national ILI consultation rate was 33.3 consultations per 1,000 patient visits, which is similar to week 03 with 36.1 consultations per 1,000. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (97.1 per 1,000 consultations in week 04) followed by children between 5 and 19 years (47.6 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 04 was 17.7%. The proportion of positive tests increased from week 45 to 52, and now appears to have peaked. Of the 1155 positive tests reported during week 04, 380 specimens were reported as influenza A/H3N2, 55 as pandemic H1N1 2009 (BC, AB, SK, ON, QC, NB), 62 as influenza B (BC, AB, ON, QC & NB) and 658 as unsubtyped influenza A. The majority of influenza virus detections to date this season were influenza A viruses (97.3% or 9250/9504). Since the beginning of the season, 88.9% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 04, detections of pandemic H1N1 2009 represented 12.6% of all subtyped influenza A specimens, a slight decrease from 16.9% in week 03. Detections of influenza B increased slightly from 3.4% of all positive influenza specimens in week 03 to 5.4% in week 04. During week 04, 55.2% (79/143) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 50.4% (1252/2485) (see Tests detailed table). In week 04, the proportion of positive tests for respiratory syncytial virus detections (RSV) increased slightly from at 12.5% to 15.0% of specimens tested while low levels of parainfluenza (1.9%) and adenovirus (1.6%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (January 23 to January 29, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to January 29, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>9</TD><TD class=alignCenter>6</TD><TD class=alignCenter>8</TD><TD class=alignCenter>140</TD><TD class=alignCenter>0</TD><TD class=alignCenter>50</TD><TD class=alignCenter>40</TD><TD class=alignCenter>50</TD><TD class=alignCenter>21</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>57</TD><TD class=alignCenter>0</TD><TD class=alignCenter>44</TD><TD class=alignCenter>10</TD><TD class=alignCenter>3</TD><TD class=alignCenter>10</TD><TD class=alignCenter>377</TD><TD class=alignCenter>0</TD><TD class=alignCenter>304</TD><TD class=alignCenter>61</TD><TD class=alignCenter>12</TD><TD class=alignCenter>32</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>35</TD><TD class=alignCenter>0</TD><TD class=alignCenter>33</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>70</TD><TD class=alignCenter>0</TD><TD class=alignCenter>40</TD><TD class=alignCenter>1</TD><TD class=alignCenter>29</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>474</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>417</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>440</TD><TD class=alignCenter>0</TD><TD class=alignCenter>138</TD><TD class=alignCenter>20</TD><TD class=alignCenter>282</TD><TD class=alignCenter>26</TD><TD class=alignCenter>4603</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1831</TD><TD class=alignCenter>196</TD><TD class=alignCenter>2576</TD><TD class=alignCenter>140</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>457</TD><TD class=alignCenter>0</TD><TD class=alignCenter>122</TD><TD class=alignCenter>2</TD><TD class=alignCenter>333</TD><TD class=alignCenter>17</TD><TD class=alignCenter>3456</TD><TD class=alignCenter>0</TD><TD class=alignCenter>392</TD><TD class=alignCenter>13</TD><TD class=alignCenter>3051</TD><TD class=alignCenter>53</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>48</TD><TD class=alignCenter>0</TD><TD class=alignCenter>32</TD><TD class=alignCenter>13</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>91</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>22</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1093</TD><TD class=alignCenter>0</TD><TD class=alignCenter>380</TD><TD class=alignCenter>55</TD><TD class=alignCenter>658</TD><TD class=alignCenter>62</TD><TD class=alignCenter>9250</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2748</TD><TD class=alignCenter>342</TD><TD class=alignCenter>6160</TD><TD class=alignCenter>254</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(January 23 to January 29, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Jan. 29, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>45</TD><TD class=alignCenter>4</TD><TD class=alignCenter>28</TD><TD class=alignCenter>13</TD><TD class=alignCenter>7</TD><TD class=alignCenter>550</TD><TD class=alignCenter>52</TD><TD class=alignCenter>386</TD><TD class=alignCenter>112</TD><TD class=alignCenter>30</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>21</TD><TD class=alignCenter>4</TD><TD class=alignCenter>8</TD><TD class=alignCenter>9</TD><TD class=alignCenter>6</TD><TD class=alignCenter>263</TD><TD class=alignCenter>35</TD><TD class=alignCenter>134</TD><TD class=alignCenter>94</TD><TD class=alignCenter>28</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>35</TD><TD class=alignCenter>8</TD><TD class=alignCenter>17</TD><TD class=alignCenter>10</TD><TD class=alignCenter>6</TD><TD class=alignCenter>544</TD><TD class=alignCenter>106</TD><TD class=alignCenter>297</TD><TD class=alignCenter>141</TD><TD class=alignCenter>26</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>24</TD><TD class=alignCenter>6</TD><TD class=alignCenter>10</TD><TD class=alignCenter>8</TD><TD class=alignCenter>2</TD><TD class=alignCenter>416</TD><TD class=alignCenter>71</TD><TD class=alignCenter>238</TD><TD class=alignCenter>107</TD><TD class=alignCenter>17</TD></TR><TR><TD>65+</TD><TD class=alignCenter>123</TD><TD class=alignCenter>2</TD><TD class=alignCenter>79</TD><TD class=alignCenter>42</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1483</TD><TD class=alignCenter>22</TD><TD class=alignCenter>1252</TD><TD class=alignCenter>209</TD><TD class=alignCenter>23</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>183</TD><TD class=alignCenter>3</TD><TD class=alignCenter>178</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>249</TD><TD class=alignCenter>24</TD><TD class=alignCenter>143</TD><TD class=alignCenter>82</TD><TD class=alignCenter>25</TD><TD class=alignCenter>3439</TD><TD class=alignCenter>289</TD><TD class=alignCenter>2485</TD><TD class=alignCenter>665</TD><TD class=alignCenter>124</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 04 (ending 29 January, 2011), 24 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 3 from MB, 9 from ON, 9 from QC, 2 from AB, and 1 from SK. This number is decreased compared to the previous week (week 03) in which 35 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in ON in week 48, and one death in a child aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in ON in week 04.
Since the beginning of the season, 291 hospitalizations with laboratory-confirmed influenza have been reported from BC, AB, SK, MB, ON, QC & NL; 56 (19.2%) as influenza A/H3N2, 8 (2.8%) pandemic H1N1 2009, 208 (71.5%) as unsubytped influenza A, and 19 (6.5%) influenza B. The distribution of cases to date by age group was as follows: 18.6% among 0-5 month olds; 28.9% among 6-23 month olds; 27.8% among the 2-4 year-olds; 16.2% among 5-9 year-olds; and 8.6% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 04 (week ending 29 January 2011) 26 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number decreased for the second week in a row, compared to 56 adult hospitalizations in week 03 and 86 in week 02 (note that numbers may fluctuate because of the delays in reporting). Of the 26 cases reported between January 23 and 29, 2011, 24 (92.3%) tested positive for unsubtyped influenza A, 1 (3.8%) as influenza A/H3N2, and 1 (3.8%) as pandemic H1N1 2009. Since the beginning of the season, 647 hospitalized cases have been reported: 167 (25.8%) A/H3N2, 26 (4.0%) pandemic H1N1 2009, 444 (68.6%) influenza A unsubtyped, and 10 (1.5%) influenza B, from all reporting provinces except NB and NL. To date, 462 of the 647 (71.4%) cases were aged 65 years or older and 280 (43.3%) were males.

Ten provinces and territories (excluding BC, QC and NB) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 04, ON reported 10 deaths, 2 with pandemic H1N1 2009, 5 with A/H3N2, and 3 with unsubtyped influenza A (note that numbers may fluctuate because of the delays in reporting). Among the 84 fatal cases currently reported since the beginning of the influenza season, 5 deaths were reported from MB and 79 from ON; influenza A/H3N2 was identified in 63.1% (53/84), unsubtyped influenza A in 29.8% (25/84), pandemic H1N1 2009 in 5 cases (6.0%), and influenza B in one case (1.2%). Seventy-six percent (64/84) of these fatal cases were among persons 65 years of age or older, and another 14% (12/84) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

[...]
http://origin.phac-aspc.gc.ca/fluwatch/10-11/w04_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 5 - 95 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 5 - 95 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>January 30 to February 5, 2011 (Week 05)</H1></TD></TR></TBODY></TABLE>

Posted 2011-02-11


Overall Influenza Summary ? Week 5 (January 30 to February 5, 2011)

In week 05, 18 regions reported localized activity (in BC(2), AB(2), ON(6), QC(2), NS(1), NB(4) & PE(1)), 27 regions reported sporadic activity (in all provinces and territories except YK) and 11 regions presented no activity. (See Activity level Map). Compared to the previous week (week 04), 10 regions reported an increased level of influenza activity, 8 regions reported decreased activity, and 29 regions maintained a stable level of influenza activity (sporadic or higher). During week 05, 29 new ILI/influenza outbreaks were reported: 11 in long-term care facilities (LTCF) in ON(4), QC(4), NB (2) and PE(1); 9 school outbreaks in BC(1), NB(7) and NL(1); 2 outbreaks in hospitals in ON; and 7 outbreaks in other facilities in BC(1) and ON(6).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 5


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w05-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w05-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 05, the national ILI consultation rate was 29.9 consultations per 1,000 patient visits, which is similar to week 04 with 26.6 consultations per 1,000. This rate is still within the expected levels for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (72.5 per 1,000 consultations in week 05) followed by children between 5 and 19 years (54.1 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w05-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 05 was 19.8%. The proportion of positive
tests decreased from a peak at week 52, but increased slightly in week 05, likely due to an increase in the
proportion of positive tests in Ontario and the Atlantic provinces. Of the 1359 positive tests reported during week
05, 401 (30%) specimens were reported as influenza A/H3N2, 88 (7%) as pandemic H1N1 2009, 101 (7%) as
influenza B and 769 (57%) as unsubtyped influenza A. The majority of influenza virus detections to date this
season were influenza A viruses (96.8% or 10471/10821). Since the beginning of the season, 88.0% of the
subtyped positive influenza A specimens were influenza A/H3N2. In week 05, detections of pandemic H1N1 2009
represented 18.0% of all subtyped influenza A specimens, an increase from 12.6% in week 04. Detections of
influenza B increased slightly from 5.4% of all positive influenza specimens in week 04 to 7.4% in week 05.
During week 05, 51.8% (72/139) of cases with A/H3N2 reported through the detailed case-based laboratory
reporting were aged 65 years or older, while since August 29, 2010, the proportion was 49.8% (1384/2778) (see
Tests detailed table). In week 05, the proportion of positive tests for respiratory syncytial virus detections (RSV)
increased slightly from at 15.0% to 16.9% of specimens tested while low levels of parainfluenza (2.1%) and
rhinovirus (4.0%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (January 30 to February 5, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to February 5, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>14</TD><TD class=alignCenter>3</TD><TD class=alignCenter>8</TD><TD class=alignCenter>161</TD><TD class=alignCenter>0</TD><TD class=alignCenter>54</TD><TD class=alignCenter>54</TD><TD class=alignCenter>53</TD><TD class=alignCenter>29</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>70</TD><TD class=alignCenter>0</TD><TD class=alignCenter>36</TD><TD class=alignCenter>17</TD><TD class=alignCenter>17</TD><TD class=alignCenter>19</TD><TD class=alignCenter>448</TD><TD class=alignCenter>0</TD><TD class=alignCenter>341</TD><TD class=alignCenter>78</TD><TD class=alignCenter>29</TD><TD class=alignCenter>51</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>42</TD><TD class=alignCenter>0</TD><TD class=alignCenter>36</TD><TD class=alignCenter>2</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>112</TD><TD class=alignCenter>0</TD><TD class=alignCenter>76</TD><TD class=alignCenter>3</TD><TD class=alignCenter>33</TD><TD class=alignCenter>7</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>480</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>423</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>582</TD><TD class=alignCenter>0</TD><TD class=alignCenter>155</TD><TD class=alignCenter>21</TD><TD class=alignCenter>406</TD><TD class=alignCenter>48</TD><TD class=alignCenter>5147</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1986</TD><TD class=alignCenter>217</TD><TD class=alignCenter>2944</TD><TD class=alignCenter>184</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>442</TD><TD class=alignCenter>0</TD><TD class=alignCenter>106</TD><TD class=alignCenter>9</TD><TD class=alignCenter>327</TD><TD class=alignCenter>19</TD><TD class=alignCenter>3898</TD><TD class=alignCenter>0</TD><TD class=alignCenter>498</TD><TD class=alignCenter>22</TD><TD class=alignCenter>3378</TD><TD class=alignCenter>72</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>84</TD><TD class=alignCenter>0</TD><TD class=alignCenter>57</TD><TD class=alignCenter>21</TD><TD class=alignCenter>6</TD><TD class=alignCenter>5</TD><TD class=alignCenter>175</TD><TD class=alignCenter>0</TD><TD class=alignCenter>110</TD><TD class=alignCenter>43</TD><TD class=alignCenter>22</TD><TD class=alignCenter>7</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>4</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1258</TD><TD class=alignCenter>0</TD><TD class=alignCenter>401</TD><TD class=alignCenter>88</TD><TD class=alignCenter>769</TD><TD class=alignCenter>101</TD><TD class=alignCenter>10471</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3150</TD><TD class=alignCenter>430</TD><TD class=alignCenter>6891</TD><TD class=alignCenter>351</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(January 30 to February 5, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Feb. 5, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>37</TD><TD class=alignCenter>7</TD><TD class=alignCenter>21</TD><TD class=alignCenter>9</TD><TD class=alignCenter>7</TD><TD class=alignCenter>623</TD><TD class=alignCenter>66</TD><TD class=alignCenter>435</TD><TD class=alignCenter>122</TD><TD class=alignCenter>45</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>19</TD><TD class=alignCenter>4</TD><TD class=alignCenter>13</TD><TD class=alignCenter>2</TD><TD class=alignCenter>12</TD><TD class=alignCenter>302</TD><TD class=alignCenter>46</TD><TD class=alignCenter>163</TD><TD class=alignCenter>93</TD><TD class=alignCenter>49</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>38</TD><TD class=alignCenter>14</TD><TD class=alignCenter>16</TD><TD class=alignCenter>8</TD><TD class=alignCenter>5</TD><TD class=alignCenter>631</TD><TD class=alignCenter>143</TD><TD class=alignCenter>333</TD><TD class=alignCenter>155</TD><TD class=alignCenter>34</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>27</TD><TD class=alignCenter>2</TD><TD class=alignCenter>17</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>472</TD><TD class=alignCenter>80</TD><TD class=alignCenter>272</TD><TD class=alignCenter>120</TD><TD class=alignCenter>20</TD></TR><TR><TD>65+</TD><TD class=alignCenter>94</TD><TD class=alignCenter>2</TD><TD class=alignCenter>72</TD><TD class=alignCenter>20</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1632</TD><TD class=alignCenter>24</TD><TD class=alignCenter>1384</TD><TD class=alignCenter>224</TD><TD class=alignCenter>23</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>197</TD><TD class=alignCenter>3</TD><TD class=alignCenter>191</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>216</TD><TD class=alignCenter>29</TD><TD class=alignCenter>139</TD><TD class=alignCenter>48</TD><TD class=alignCenter>26</TD><TD class=alignCenter>3857</TD><TD class=alignCenter>362</TD><TD class=alignCenter>2778</TD><TD class=alignCenter>717</TD><TD class=alignCenter>171</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 05 (ending 5 February 2011), 29 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 2 from AB, 1 from MB, 13 from ON, 12 from QC, and 1 from NS. This number is decreased compared to the previous week (week 04) in which 35 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.

Since the beginning of the season, 330 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 60 (18.2%) as influenza A/H3N2, 10 (3.0%) pandemic H1N1 2009, 233 (70.6%) as unsubytped influenza A, and 27 (8.2%) influenza B. The distribution of cases to date by age group was as follows: 17.9% among 0-5 month olds; 30.3% among 6-23 month olds; 27.0% among the 2-4 year-olds; 16.1% among 5-9 year-olds; and 8.8% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 05 (ending 5 February 2011) 26 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number decreased for the second week in a row, compared to 39 adult hospitalizations in week 04 and 59 in week 03 (note that numbers may fluctuate because of the delays in reporting). Of the 26 new cases reported between January 30 and February 5, 2011, 23 (88.5%) tested positive for unsubtyped influenza A, 2 (7.7%) as influenza A/H3N2, and 1 (3.8%) as influenza B. Since the beginning of the season, 694 hospitalized cases have been reported: 170 (24.5%) A/H3N2, 29 (4.2%) pandemic H1N1 2009, 483 (69.6%) influenza A unsubtyped, and 12 (1.7%) influenza B, from all reporting provinces except NB and NL. To date, 494 of the 694 (71.2%) cases were aged 65 years or older and 305 (43.9%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 05, ON reported 5 deaths, 1 with pandemic H1N1 2009, 1 with A/H3N2, and 3 with unsubtyped influenza A (note that numbers may fluctuate because of the delays in reporting). Among the 95 fatal cases currently reported since the beginning of the influenza season, influenza A/H3N2 was identified in 61.1% (58/95), unsubtyped influenza A in 31.6% (30/95), pandemic H1N1 2009 in 6 cases (6.3%), and influenza B in one case (1.1%). Seventy-three percent (69/95) of these fatal cases were among persons 65 years of age or older, and another 15% (14/95) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

[...]
http://www.phac-aspc.gc.ca/fluwatch/10-11/w05_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 6 - 122 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 6 - 122 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>February 6 to February 12, 2011 (Week 06)</H1></TD></TR></TBODY></TABLE>

Posted 2011-02-18


Overall Influenza Summary ? Week 6 (February 6 to February 12, 2011)

In week 06, one region in Quebec (Montreal/Laval) reported widespread influenza/ILI activity, 23 regions reported localized activity (in AB(2), SK(1), MB(1), ON(6), QC(4), NB(5), NS(3), and NL(1)), 25 regions reported sporadic activity (in all provinces and territories) and 7 regions presented no activity. (See Activity level Map). Compared to the previous week (week 05), 18 regions reported an increased level of influenza activity, 8 regions reported decreased activity, and 26 regions maintained a stable level of influenza activity (sporadic or higher). During week 06, 34 new ILI/influenza outbreaks were reported: 21 in long-term care facilities (LTCF) in MB(1), ON(8), QC(7), NB (1) and NS(4); 9 school outbreaks in AB(2), and NB(7); and 4 outbreaks in other facilities in AB(1) and ON(3).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 6


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w06-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w06-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 06, the national ILI consultation rate was 35.7 consultations per 1,000 patient visits, an increase from week 05, however still within expected range for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (84.2 per 1,000 consultations in week 06) followed by children between 5 and 19 years (65.4 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w06-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 06 was 20.2%. The proportion of positive tests has increased slightly in weeks 05 and 06, due to an increase in the proportion of positive tests in BC, QC, and the Atlantic provinces. Of the 1280 positive tests reported during week 06, 420 (33%) specimens were reported as influenza A/H3N2, 88 (7%) as pandemic H1N1 2009, 119 (9%) as influenza B and 653 (51%) as unsubtyped influenza A. The majority of influenza virus detections to date this season were influenza A viruses (96.1% or 11,575/12,044). Since the beginning of the season, 87.0% of the subtyped positive influenza A specimens were influenza A/H3N2.In week 06, detections of pandemic H1N1 2009 represented 17.3% of all subtyped influenza A specimens, which is similar to the proportion observed in week 05. Detections of influenza B increased slightly from 7.4% of all positive influenza specimens in week 05 to 9.3% in week 06. During week 06, 52.8% (57/108) of cases with A/H3N2 reported through the detailed case-based laboratory reporting were aged 65 years or older, while since August 29, 2010, the proportion was 49.4% (1499/3036) (see Tests detailed table). In week 06, the proportion of positive tests for respiratory syncytial virus detections (RSV) increased from 16.9% to 19.0% of specimens tested while low levels of parainfluenza (2.5%) and rhinovirus (5.7%) continue to be reported (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (February 6 to February 12, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to February 12, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>30</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>14</TD><TD class=alignCenter>7</TD><TD class=alignCenter>11</TD><TD class=alignCenter>191</TD><TD class=alignCenter>0</TD><TD class=alignCenter>63</TD><TD class=alignCenter>68</TD><TD class=alignCenter>60</TD><TD class=alignCenter>40</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>69</TD><TD class=alignCenter>0</TD><TD class=alignCenter>38</TD><TD class=alignCenter>15</TD><TD class=alignCenter>16</TD><TD class=alignCenter>35</TD><TD class=alignCenter>527</TD><TD class=alignCenter>0</TD><TD class=alignCenter>397</TD><TD class=alignCenter>99</TD><TD class=alignCenter>31</TD><TD class=alignCenter>86</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>34</TD><TD class=alignCenter>0</TD><TD class=alignCenter>24</TD><TD class=alignCenter>6</TD><TD class=alignCenter>4</TD><TD class=alignCenter>2</TD><TD class=alignCenter>146</TD><TD class=alignCenter>0</TD><TD class=alignCenter>100</TD><TD class=alignCenter>9</TD><TD class=alignCenter>37</TD><TD class=alignCenter>9</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>491</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>434</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>427</TD><TD class=alignCenter>0</TD><TD class=alignCenter>126</TD><TD class=alignCenter>10</TD><TD class=alignCenter>291</TD><TD class=alignCenter>39</TD><TD class=alignCenter>5507</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2112</TD><TD class=alignCenter>227</TD><TD class=alignCenter>3168</TD><TD class=alignCenter>222</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>435</TD><TD class=alignCenter>0</TD><TD class=alignCenter>129</TD><TD class=alignCenter>5</TD><TD class=alignCenter>301</TD><TD class=alignCenter>25</TD><TD class=alignCenter>4333</TD><TD class=alignCenter>0</TD><TD class=alignCenter>627</TD><TD class=alignCenter>27</TD><TD class=alignCenter>3679</TD><TD class=alignCenter>97</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>121</TD><TD class=alignCenter>0</TD><TD class=alignCenter>81</TD><TD class=alignCenter>37</TD><TD class=alignCenter>3</TD><TD class=alignCenter>6</TD><TD class=alignCenter>296</TD><TD class=alignCenter>0</TD><TD class=alignCenter>191</TD><TD class=alignCenter>80</TD><TD class=alignCenter>25</TD><TD class=alignCenter>13</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>20</TD><TD class=alignCenter>1</TD><TD class=alignCenter>45</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>5</TD><TD class=alignCenter>29</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>23</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1161</TD><TD class=alignCenter>0</TD><TD class=alignCenter>420</TD><TD class=alignCenter>88</TD><TD class=alignCenter>653</TD><TD class=alignCenter>119</TD><TD class=alignCenter>11575</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3588</TD><TD class=alignCenter>524</TD><TD class=alignCenter>7463</TD><TD class=alignCenter>469</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(February 6 to February 12, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Feb. 12, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>36</TD><TD class=alignCenter>5</TD><TD class=alignCenter>23</TD><TD class=alignCenter>8</TD><TD class=alignCenter>10</TD><TD class=alignCenter>688</TD><TD class=alignCenter>79</TD><TD class=alignCenter>480</TD><TD class=alignCenter>129</TD><TD class=alignCenter>59</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>24</TD><TD class=alignCenter>3</TD><TD class=alignCenter>11</TD><TD class=alignCenter>10</TD><TD class=alignCenter>23</TD><TD class=alignCenter>347</TD><TD class=alignCenter>54</TD><TD class=alignCenter>190</TD><TD class=alignCenter>103</TD><TD class=alignCenter>76</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>33</TD><TD class=alignCenter>9</TD><TD class=alignCenter>8</TD><TD class=alignCenter>16</TD><TD class=alignCenter>6</TD><TD class=alignCenter>707</TD><TD class=alignCenter>163</TD><TD class=alignCenter>365</TD><TD class=alignCenter>179</TD><TD class=alignCenter>43</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>17</TD><TD class=alignCenter>3</TD><TD class=alignCenter>8</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>515</TD><TD class=alignCenter>90</TD><TD class=alignCenter>302</TD><TD class=alignCenter>123</TD><TD class=alignCenter>23</TD></TR><TR><TD>65+</TD><TD class=alignCenter>81</TD><TD class=alignCenter>2</TD><TD class=alignCenter>57</TD><TD class=alignCenter>22</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1765</TD><TD class=alignCenter>27</TD><TD class=alignCenter>1499</TD><TD class=alignCenter>239</TD><TD class=alignCenter>29</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>205</TD><TD class=alignCenter>3</TD><TD class=alignCenter>200</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>192</TD><TD class=alignCenter>22</TD><TD class=alignCenter>108</TD><TD class=alignCenter>62</TD><TD class=alignCenter>43</TD><TD class=alignCenter>4227</TD><TD class=alignCenter>416</TD><TD class=alignCenter>3036</TD><TD class=alignCenter>775</TD><TD class=alignCenter>230</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 06, 33 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 2 from BC, 2 from AB, 15 from ON, and 14 from QC. This number is decreased compared to the previous week (week 05) in which 36 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.
Since the beginning of the season, 372 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 61 (16.4%) as influenza A/H3N2, 11 (3.0%) pandemic H1N1 2009, 265 (71.2%) as unsubytped influenza A, and 35 (9.4%) influenza B. The distribution of cases to date by age group was as follows: 18.5% among 0-5 month olds; 30.4% among 6-23 month olds; 26.6% among the 2-4 year-olds; 16.1% among 5-9 year-olds; and 8.3% among children 10-16 years old.
Adult Influenza Hospitalizations and Deaths
During week 06, 39 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number is increased compared to the 26 cases reported in week 05 and the same number of cases as were reported in week 04 (note that numbers may fluctuate because of the delays in reporting). Of the 39 new cases reported between February 6 and 12, 2011, 30 (76.9%) tested positive for unsubtyped influenza A, 6 (15.4%) as influenza A/H3N2, 2 (5.1%) as pandemic H1N1 2009, and 1 (2.6%) as influenza B. Since the beginning of the season, 733 hospitalized cases have been reported: 176 (24.0%) A/H3N2, 31 (4.2%) pandemic H1N1 2009, 513 (70.0%) influenza A unsubtyped, and 13 (1.8%) influenza B, from all reporting provinces except NL. To date, 515 of the 733 (70.3%) cases were aged 65 years or older and 328 (44.7%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 06, ON reported 5 deaths, all among persons 65 years of age or older: 3 with A/H3N2, 1 with unsubtyped influenza A, and 1 with influenza B (note that numbers may fluctuate because of the delays in reporting). Among the 122 fatal cases currently reported since the beginning of the influenza season, influenza A/H3N2 was identified in 63.9% (78/122), unsubtyped influenza A in 27.9% (34/122), pandemic H1N1 2009 in 5.7% (7/122), and influenza B in 2.5% (3/122). Seventy-six percent (93/122) of these fatal cases were among persons 65 years of age or older, and another 13% (16/122) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2.

[...]
http://origin.phac-aspc.gc.ca/fluwatch/10-11/w06_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 7 - 134 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 7 - 134 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>February 13 to February 19, 2011 (Week 07)</H1></TD></TR></TBODY></TABLE>

Posted 2011-02-25


Overall Influenza Summary ? Week 7 (February 13 to February 19, 2011)

In week 07, 35 regions reported localized activity (in all provinces except PE), 15 regions reported sporadic activity (in all provinces and territories except YK) and 6 regions presented no activity (see Activity level Map). Compared to the previous week (week 06), 15 regions reported an increased level of influenza activity, 5 regions reported decreased activity, and 33 regions maintained a stable level of influenza activity (sporadic or higher). Fifty-one new ILI/influenza outbreaks were reported: 26 in long-term care facilities (LTCF) in BC(2), SK (5), ON(4), QC(7), NB (2) and NS(6); 20 school outbreaks in AB(2), NB(15), NS(1) and NL(2); 1 hospital outbreak in ON; and 4 outbreaks in other facilities in SK(1), ON(2) and NL(1).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 7


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
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</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 07, the national ILI consultation rate was 29.4 consultations per 1,000 patient visits, a similar rate to that observed during the previous 4 weeks, and still within expected range for this time of year (see ILI graph). Children between 5 and 19 years old had the highest consultation rates (70.3 per 1,000 consultations in week 07) followed by children under 5 years of age (66.8 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 07 was 18.7%, which is decreased from 20.2% in week 06. The proportion of positive tests peaked in week 52, deviated slightly from the downward trend during weeks 05 and 06, but decreased in week 07. Of the 1150 positive tests reported during week 07, 337 (29%) specimens were reported as influenza A/H3N2, 92 (8%) as pandemic H1N1 2009, 113 (10%) as influenza B and 608 (53%) as unsubtyped influenza A. Since the beginning of the season, the majority of influenza virus detections have been influenza A viruses (95.6% or 12,651/13,235), and among subtyped influenza A specimens 86.3% have been A/H3N2.In week 07, detections of pandemic H1N1 2009 represented 21.4% of all subtyped influenza A specimens, which is increased from the proportion of 17.3% observed in week 06. Detections of influenza B remained stable at 9.8% of all positive influenza specimens in week 07 compared to 9.3% in week 06. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 52.4% (1619/3090) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (93.8%) of cases with pandemic H1N1 2009 were under 65 years of age. (see Tests detailed table). In week 07, the proportion of positive tests for respiratory syncytial virus detections (RSV) was 19.0% of specimens tested (See Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (February 13 to February 19, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to February 19, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>33</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>19</TD><TD class=alignCenter>2</TD><TD class=alignCenter>12</TD><TD class=alignCenter>224</TD><TD class=alignCenter>0</TD><TD class=alignCenter>75</TD><TD class=alignCenter>87</TD><TD class=alignCenter>62</TD><TD class=alignCenter>52</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>80</TD><TD class=alignCenter>0</TD><TD class=alignCenter>48</TD><TD class=alignCenter>24</TD><TD class=alignCenter>8</TD><TD class=alignCenter>48</TD><TD class=alignCenter>607</TD><TD class=alignCenter>0</TD><TD class=alignCenter>452</TD><TD class=alignCenter>130</TD><TD class=alignCenter>25</TD><TD class=alignCenter>135</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>43</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>12</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>189</TD><TD class=alignCenter>0</TD><TD class=alignCenter>128</TD><TD class=alignCenter>21</TD><TD class=alignCenter>40</TD><TD class=alignCenter>9</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>502</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>445</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>346</TD><TD class=alignCenter>0</TD><TD class=alignCenter>73</TD><TD class=alignCenter>7</TD><TD class=alignCenter>266</TD><TD class=alignCenter>29</TD><TD class=alignCenter>5892</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2185</TD><TD class=alignCenter>234</TD><TD class=alignCenter>3473</TD><TD class=alignCenter>252</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>360</TD><TD class=alignCenter>0</TD><TD class=alignCenter>75</TD><TD class=alignCenter>2</TD><TD class=alignCenter>283</TD><TD class=alignCenter>21</TD><TD class=alignCenter>4693</TD><TD class=alignCenter>0</TD><TD class=alignCenter>702</TD><TD class=alignCenter>29</TD><TD class=alignCenter>3962</TD><TD class=alignCenter>118</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>120</TD><TD class=alignCenter>0</TD><TD class=alignCenter>78</TD><TD class=alignCenter>27</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>416</TD><TD class=alignCenter>0</TD><TD class=alignCenter>269</TD><TD class=alignCenter>107</TD><TD class=alignCenter>40</TD><TD class=alignCenter>15</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>18</TD><TD class=alignCenter>0</TD><TD class=alignCenter>74</TD><TD class=alignCenter>0</TD><TD class=alignCenter>21</TD><TD class=alignCenter>6</TD><TD class=alignCenter>47</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>24</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>1037</TD><TD class=alignCenter>0</TD><TD class=alignCenter>337</TD><TD class=alignCenter>92</TD><TD class=alignCenter>608</TD><TD class=alignCenter>113</TD><TD class=alignCenter>12651</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3932</TD><TD class=alignCenter>623</TD><TD class=alignCenter>8096</TD><TD class=alignCenter>584</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(February 12 to February 19, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Feb. 19, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>22</TD><TD class=alignCenter>2</TD><TD class=alignCenter>17</TD><TD class=alignCenter>3</TD><TD class=alignCenter>11</TD><TD class=alignCenter>746</TD><TD class=alignCenter>88</TD><TD class=alignCenter>528</TD><TD class=alignCenter>130</TD><TD class=alignCenter>70</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>21</TD><TD class=alignCenter>3</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD><TD class=alignCenter>26</TD><TD class=alignCenter>388</TD><TD class=alignCenter>63</TD><TD class=alignCenter>224</TD><TD class=alignCenter>101</TD><TD class=alignCenter>113</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>29</TD><TD class=alignCenter>11</TD><TD class=alignCenter>12</TD><TD class=alignCenter>6</TD><TD class=alignCenter>7</TD><TD class=alignCenter>774</TD><TD class=alignCenter>195</TD><TD class=alignCenter>394</TD><TD class=alignCenter>185</TD><TD class=alignCenter>52</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>31</TD><TD class=alignCenter>12</TD><TD class=alignCenter>12</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>568</TD><TD class=alignCenter>110</TD><TD class=alignCenter>325</TD><TD class=alignCenter>133</TD><TD class=alignCenter>27</TD></TR><TR><TD>65+</TD><TD class=alignCenter>109</TD><TD class=alignCenter>2</TD><TD class=alignCenter>74</TD><TD class=alignCenter>33</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1922</TD><TD class=alignCenter>30</TD><TD class=alignCenter>1619</TD><TD class=alignCenter>273</TD><TD class=alignCenter>30</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>219</TD><TD class=alignCenter>3</TD><TD class=alignCenter>214</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>214</TD><TD class=alignCenter>30</TD><TD class=alignCenter>133</TD><TD class=alignCenter>51</TD><TD class=alignCenter>47</TD><TD class=alignCenter>4617</TD><TD class=alignCenter>489</TD><TD class=alignCenter>3304</TD><TD class=alignCenter>824</TD><TD class=alignCenter>292</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 07, 23 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 3 from AB, 6 from ON, 11 from QC and 3 from NL. This number is decreased compared to the previous week (week 06) in which 45 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.
Since the beginning of the season, 418 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 66 (15.8%) as influenza A/H3N2, 13 (3.1%) pandemic H1N1 2009, 289 (69.1%) as unsubytped influenza A, and 50 (12.0%) influenza B. The distribution of cases to date by age group was as follows: 18.9% among 0-5 month olds; 28.5% among 6-23 month olds; 28.7% among the 2-4 year-olds; 14.8% among 5-9 year-olds; and 9.1% among children 10-16 years old.
Adult Influenza Hospitalizations and Deaths
During week 07, 27 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number is decreased compared to the 39 cases reported in week 06 (note that numbers may fluctuate because of the delays in reporting). Of the 27 new cases reported between February 13 and 19, 2011, 21 (77.8%) tested positive for unsubtyped influenza A, 3 (11.1%) as influenza A/H3N2, and 3 (11.1%) as influenza B. Since the beginning of the season, 784 hospitalized cases have been reported: 184 (23.5%) A/H3N2, 29 (3.7%) pandemic H1N1 2009, 555 (70.8%) influenza A unsubtyped, and 16 (2.0%) influenza B, from all reporting provinces except NL. To date, 544 of the 784 (69.4%) cases were aged 65 years or older and 354 (54.2%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 07, 3 deaths were reported, one in each of AB, MB and ON. One case was between 20 and 44 years old with pandemic H1N1 2009 detected, and the other two were in persons >65 years old with A/H3N2. Among the 134 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 64.9% (87/134), unsubtyped influenza A in 26.9% (36/134), pandemic H1N1 2009 in 6.0% (8/134), and influenza B in 2.2% (3/134). Seventy-five percent (101/134) of these fatal cases were among persons 65 years of age or older, and another 13% (17/134) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

[...]
http://www.phac-aspc.gc.ca/fluwatch/10-11/w07_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 8 - 150 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 8 - 150 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>February 20 to February 26, 2011 (Week 08)</H1></TD></TR></TBODY></TABLE>

Posted 2011-03-04


Overall Influenza Summary ? Week 8 (February 20 to February 26, 2011)

In week 08, 4 regions (in BC(2) and QC(2)) reported widespread activity, 20 regions reported localized activity (in AB(1), SK(2), ON(5), QC(1), NB(6), NS(4), and NL(1)), 23 regions reported sporadic activity (in all provinces and territories except YK) and 9 regions presented no activity (see Activity level Map). Compared to the previous week (week 07), 7 regions reported an increased level of influenza activity, 18 regions reported decreased activity, and 28 regions maintained a stable level of influenza activity (sporadic or higher). Forty-four new outbreaks were reported: 23 outbreaks of influenza in long-term care facilities (LTCF) in BC(5), SK (2), ON(2), QC(6), NB (6) and NS(2); 1 influenza B school outbreak in AB, 19 ILI outbreaks in schools in NB; and one ILI outbreak in a facility in AB.

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 8


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
leg_ccccff.gif
</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
leg_6666ff.gif
</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w08-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 08, the national ILI consultation rate was 36.5 consultations per 1,000 patient visits, an increase from 29.3 in week 07 but still within expected range for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (87.1 per 1,000 consultations in week 08) followed by children between 5 and 19 years old (68.2 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w08-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 08 was 17.8%, which decreased slightly from 18.7% in week 07. The proportion of positive tests peaked in week 52. Of the 1055 positive tests reported during week 08, 363 (34.4%) specimens were reported as influenza A/H3N2, 73 (6.9%) as pandemic H1N1 2009, 130 (12.3%) as influenza B and 489 (46.4%) as unsubtyped influenza A. Since the beginning of the season, the majority of influenza virus detections have been influenza A viruses (95.0% or 13,610/14,332), and among subtyped influenza A specimens 86.1% have been A/H3N2.In week 08, detections of pandemic H1N1 2009 represented 16.7% of all subtyped influenza A specimens, which is decreased from the proportion of 21.4% observed in week 07. Detections of influenza B increased to 12.3% of all positive influenza specimens in week 08 compared to 9.8% in week 07. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 52.0% (1723/3315) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (93.5%, 491/525) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 08, the proportion of positive tests for respiratory syncytial virus detections (RSV) was stable at 18.3% of specimens tested (See Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (February 20 to February 26, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to February 26, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>46</TD><TD class=alignCenter>0</TD><TD class=alignCenter>23</TD><TD class=alignCenter>8</TD><TD class=alignCenter>15</TD><TD class=alignCenter>13</TD><TD class=alignCenter>270</TD><TD class=alignCenter>0</TD><TD class=alignCenter>98</TD><TD class=alignCenter>95</TD><TD class=alignCenter>77</TD><TD class=alignCenter>65</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>51</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>19</TD><TD class=alignCenter>4</TD><TD class=alignCenter>27</TD><TD class=alignCenter>672</TD><TD class=alignCenter>0</TD><TD class=alignCenter>499</TD><TD class=alignCenter>150</TD><TD class=alignCenter>23</TD><TD class=alignCenter>164</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>32</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>2</TD><TD class=alignCenter>10</TD><TD class=alignCenter>3</TD><TD class=alignCenter>221</TD><TD class=alignCenter>0</TD><TD class=alignCenter>148</TD><TD class=alignCenter>23</TD><TD class=alignCenter>50</TD><TD class=alignCenter>12</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>505</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>448</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>295</TD><TD class=alignCenter>0</TD><TD class=alignCenter>92</TD><TD class=alignCenter>6</TD><TD class=alignCenter>197</TD><TD class=alignCenter>39</TD><TD class=alignCenter>6207</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2277</TD><TD class=alignCenter>240</TD><TD class=alignCenter>3690</TD><TD class=alignCenter>297</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>292</TD><TD class=alignCenter>0</TD><TD class=alignCenter>72</TD><TD class=alignCenter>2</TD><TD class=alignCenter>218</TD><TD class=alignCenter>38</TD><TD class=alignCenter>4985</TD><TD class=alignCenter>0</TD><TD class=alignCenter>774</TD><TD class=alignCenter>31</TD><TD class=alignCenter>4180</TD><TD class=alignCenter>156</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>138</TD><TD class=alignCenter>0</TD><TD class=alignCenter>99</TD><TD class=alignCenter>31</TD><TD class=alignCenter>8</TD><TD class=alignCenter>9</TD><TD class=alignCenter>554</TD><TD class=alignCenter>0</TD><TD class=alignCenter>368</TD><TD class=alignCenter>138</TD><TD class=alignCenter>48</TD><TD class=alignCenter>24</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>41</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>34</TD><TD class=alignCenter>0</TD><TD class=alignCenter>115</TD><TD class=alignCenter>0</TD><TD class=alignCenter>27</TD><TD class=alignCenter>7</TD><TD class=alignCenter>81</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>36</TD><TD class=alignCenter>0</TD><TD class=alignCenter>25</TD><TD class=alignCenter>9</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>18</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>45</TD><TD class=alignCenter>0</TD><TD class=alignCenter>42</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>925</TD><TD class=alignCenter>0</TD><TD class=alignCenter>363</TD><TD class=alignCenter>73</TD><TD class=alignCenter>489</TD><TD class=alignCenter>130</TD><TD class=alignCenter>13610</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4314</TD><TD class=alignCenter>697</TD><TD class=alignCenter>8599</TD><TD class=alignCenter>722</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(February 20 to February 26, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Feb. 26, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>25</TD><TD class=alignCenter>3</TD><TD class=alignCenter>15</TD><TD class=alignCenter>7</TD><TD class=alignCenter>11</TD><TD class=alignCenter>791</TD><TD class=alignCenter>91</TD><TD class=alignCenter>565</TD><TD class=alignCenter>135</TD><TD class=alignCenter>98</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>18</TD><TD class=alignCenter>5</TD><TD class=alignCenter>9</TD><TD class=alignCenter>4</TD><TD class=alignCenter>21</TD><TD class=alignCenter>422</TD><TD class=alignCenter>70</TD><TD class=alignCenter>245</TD><TD class=alignCenter>107</TD><TD class=alignCenter>150</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>30</TD><TD class=alignCenter>5</TD><TD class=alignCenter>13</TD><TD class=alignCenter>12</TD><TD class=alignCenter>8</TD><TD class=alignCenter>825</TD><TD class=alignCenter>208</TD><TD class=alignCenter>428</TD><TD class=alignCenter>189</TD><TD class=alignCenter>72</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>26</TD><TD class=alignCenter>6</TD><TD class=alignCenter>8</TD><TD class=alignCenter>12</TD><TD class=alignCenter>1</TD><TD class=alignCenter>625</TD><TD class=alignCenter>122</TD><TD class=alignCenter>354</TD><TD class=alignCenter>149</TD><TD class=alignCenter>30</TD></TR><TR><TD>65+</TD><TD class=alignCenter>63</TD><TD class=alignCenter>1</TD><TD class=alignCenter>32</TD><TD class=alignCenter>30</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2058</TD><TD class=alignCenter>34</TD><TD class=alignCenter>1723</TD><TD class=alignCenter>301</TD><TD class=alignCenter>38</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>224</TD><TD class=alignCenter>3</TD><TD class=alignCenter>219</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>165</TD><TD class=alignCenter>20</TD><TD class=alignCenter>80</TD><TD class=alignCenter>65</TD><TD class=alignCenter>44</TD><TD class=alignCenter>4945</TD><TD class=alignCenter>528</TD><TD class=alignCenter>3534</TD><TD class=alignCenter>883</TD><TD class=alignCenter>388</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 08, 39 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 2 from BC, 11 from AB, 2 from SK, 5 from ON, 16 from QC, 1 from NS, and 2 from NL. This number is increased compared to the previous week (week 07) in which 25 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.
Since the beginning of the season, 458 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 74 (16.2%) as influenza A/H3N2, 15 (3.3%) pandemic H1N1 2009, 306 (66.8%) as unsubytped influenza A, and 63 (13.8%) influenza B. The distribution of cases to date by age group was as follows: 18.1% among 0-5 month olds; 28.4% among 6-23 month olds; 29.3% among the 2-4 year-olds; 15.3% among 5-9 year-olds; and 9.0% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 08, 21 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number is decreased compared to the 27 cases reported in week 07 (note that numbers may fluctuate because of the delays in reporting). Of the 21 new cases reported between February 20 and 26, 2011, 17 (81.0%) tested positive for unsubtyped influenza A, 1 (4.8%) as pandemic H1N1 2009, and 3 (14.3%) as influenza B. Since the beginning of the season, 821 hospitalized cases have been reported: 185 (22.5%) A/H3N2, 34 (4.1%) pandemic H1N1 2009, 581 (70.8%) influenza A unsubtyped, and 21 (2.6%) influenza B, from all reporting provinces except NL. To date, 570 of the 821 (69.4%) cases were aged 65 years or older and 370 (45.1%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 08, 1 death was reported in ON of a person >65 years old with A/H3N2. Among the 150 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 64.0% (96/150), unsubtyped influenza A in 28.7% (43/150), pandemic H1N1 2009 in 5.3% (8/150), and influenza B in 2.0% (3/150). Seventy-seven percent (115/150) of these fatal cases were among persons 65 years of age or older, and another 12% (18/150) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

[...]
http://origin.phac-aspc.gc.ca/fluwatch/10-11/w08_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 8 - 150 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 8 - 150 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD><H1>February 27 to March 5, 2011 (Week 09)</H1></TD></TR></TBODY></TABLE>

Posted 2011-03-11


Overall Influenza Summary ? Week 9 (February 27 to March 5, 2011)

In week 09, 2 regions (in QC(1) and NL(1)) reported widespread activity, 21 regions reported localized activity (in BC(4), AB(1), SK(1), MB(1), ON(5), QC(1), NB(4), NS(3), and NL(1)), 26 regions reported sporadic activity (in all provinces and territories except NT) and 7 regions presented no activity (see Activity level Map). Compared to the previous week (week 08), 12 regions reported an increased level of influenza activity, 14 regions reported decreased activity, and 25 regions maintained a stable level of influenza activity (sporadic or higher). Thirty-two new outbreaks were reported: 17 outbreaks of influenza in long-term care facilities (LTCF) in BC(4), SK (2), MB(1), ON(2), QC(3), NB (2) and NS(3); 1 influenza outbreak in a hospital in NS; 1 influenza B outbreak in a school in AB, 1 outbreak in which both influenza B and pandemic H1N1 2009 were detected in BC, 7 ILI outbreaks in schools in NB(4) and NS(3); 1 pandemic H1N1 2009 outbreak in a residential facility in BC, and 4 ILI outbreaks in other settings in ON(2) and NL(2).

<TABLE class=widthFull border=0 cellSpacing=0 cellPadding=0><TBODY><TR class=alignCenter><TD colSpan=2>Map of overall Influenza activity level by province and territory, Canada, Week 9


</TD></TR><TR class=alignCenter><TD class=alignCenter>
</TD><TD class=alignCenter><TABLE border=0 cellSpacing=0 cellPadding=1><TBODY><TR><TD><TABLE class=border-lite cellSpacing=1 cellPadding=1><TBODY><TR><TD class=alignCenter>No Data </TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>No Activity</TD><TD class=alignCenter>
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</TD></TR><TR class=alignCenter><TD class=alignCenter>Sporadic Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Localized Activity</TD><TD class=alignCenter>
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</TD></TR><TR><TD class=alignCenter>Widespread Activity</TD><TD class=alignCenter>
leg_000066.gif
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR><TR><TD class=fontSize85 colSpan=2>Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
</TD></TR></TBODY></TABLE>
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w09-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w09-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 09, the national ILI consultation rate was 37.7 consultations per 1,000 patient visits, a slight increase from 35.8 in week 08 but still within expected range for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (108.1 per 1,000 consultations in week 09) followed by children between 5 and 19 years old (83.3 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w09-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
Text Equivalent
Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 09 was 15.8%, which decreased from 17.8% in week 08. The proportion of positive tests peaked in week 52. Of the 870 positive tests reported during week 09, 317 (36.4%) specimens were reported as influenza A/H3N2, 59 (6.8%) as pandemic H1N1 2009, 156 (17.9%) as influenza B and 338 (38.9%) as unsubtyped influenza A. Since the beginning of the season, the majority of influenza virus detections have been influenza A viruses (94.2% or 14,342/15,229), and among subtyped influenza A specimens 86.0% have been A/H3N2.In week 09, detections of pandemic H1N1 2009 represented 15.7% of all subtyped influenza A specimens, which is decreased slightly from the proportion of 16.7% observed in week 08. Detections of influenza B increased to 17.9% of all positive influenza specimens in week 09 compared to 12.3% in week 08. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.8% (1813/3502) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (93.8%, 544/580) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 09, the proportion of positive tests for respiratory syncytial virus detections (RSV) was stable at 19.2% of specimens tested, reflecting an increasing proportion of positive tests in the East and declining positive tests in BC and Prairie provinces (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (February 27 to March 5, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to March 5, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>32</TD><TD class=alignCenter>8</TD><TD class=alignCenter>13</TD><TD class=alignCenter>20</TD><TD class=alignCenter>323</TD><TD class=alignCenter>0</TD><TD class=alignCenter>130</TD><TD class=alignCenter>103</TD><TD class=alignCenter>90</TD><TD class=alignCenter>85</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>51</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>19</TD><TD class=alignCenter>4</TD><TD class=alignCenter>27</TD><TD class=alignCenter>741</TD><TD class=alignCenter>0</TD><TD class=alignCenter>544</TD><TD class=alignCenter>172</TD><TD class=alignCenter>25</TD><TD class=alignCenter>200</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>38</TD><TD class=alignCenter>0</TD><TD class=alignCenter>34</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>2</TD><TD class=alignCenter>259</TD><TD class=alignCenter>0</TD><TD class=alignCenter>182</TD><TD class=alignCenter>23</TD><TD class=alignCenter>54</TD><TD class=alignCenter>14</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>508</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>451</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>211</TD><TD class=alignCenter>0</TD><TD class=alignCenter>73</TD><TD class=alignCenter>17</TD><TD class=alignCenter>121</TD><TD class=alignCenter>49</TD><TD class=alignCenter>6418</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2350</TD><TD class=alignCenter>257</TD><TD class=alignCenter>3811</TD><TD class=alignCenter>346</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>197</TD><TD class=alignCenter>0</TD><TD class=alignCenter>40</TD><TD class=alignCenter>1</TD><TD class=alignCenter>156</TD><TD class=alignCenter>52</TD><TD class=alignCenter>5182</TD><TD class=alignCenter>0</TD><TD class=alignCenter>814</TD><TD class=alignCenter>32</TD><TD class=alignCenter>4336</TD><TD class=alignCenter>208</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>92</TD><TD class=alignCenter>0</TD><TD class=alignCenter>81</TD><TD class=alignCenter>9</TD><TD class=alignCenter>2</TD><TD class=alignCenter>5</TD><TD class=alignCenter>646</TD><TD class=alignCenter>0</TD><TD class=alignCenter>449</TD><TD class=alignCenter>147</TD><TD class=alignCenter>50</TD><TD class=alignCenter>29</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>27</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>26</TD><TD class=alignCenter>1</TD><TD class=alignCenter>142</TD><TD class=alignCenter>0</TD><TD class=alignCenter>27</TD><TD class=alignCenter>8</TD><TD class=alignCenter>107</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>17</TD><TD class=alignCenter>0</TD><TD class=alignCenter>13</TD><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>38</TD><TD class=alignCenter>13</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>0</TD><TD class=alignCenter>70</TD><TD class=alignCenter>0</TD><TD class=alignCenter>58</TD><TD class=alignCenter>3</TD><TD class=alignCenter>9</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>714</TD><TD class=alignCenter>0</TD><TD class=alignCenter>317</TD><TD class=alignCenter>59</TD><TD class=alignCenter>338</TD><TD class=alignCenter>156</TD><TD class=alignCenter>14342</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4648</TD><TD class=alignCenter>759</TD><TD class=alignCenter>8935</TD><TD class=alignCenter>887</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(February 27 to March 5, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Mar. 5, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>32</TD><TD class=alignCenter>8</TD><TD class=alignCenter>14</TD><TD class=alignCenter>10</TD><TD class=alignCenter>15</TD><TD class=alignCenter>853</TD><TD class=alignCenter>102</TD><TD class=alignCenter>606</TD><TD class=alignCenter>145</TD><TD class=alignCenter>118</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>13</TD><TD class=alignCenter>2</TD><TD class=alignCenter>4</TD><TD class=alignCenter>7</TD><TD class=alignCenter>34</TD><TD class=alignCenter>443</TD><TD class=alignCenter>73</TD><TD class=alignCenter>253</TD><TD class=alignCenter>117</TD><TD class=alignCenter>192</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>29</TD><TD class=alignCenter>6</TD><TD class=alignCenter>10</TD><TD class=alignCenter>13</TD><TD class=alignCenter>14</TD><TD class=alignCenter>880</TD><TD class=alignCenter>227</TD><TD class=alignCenter>453</TD><TD class=alignCenter>200</TD><TD class=alignCenter>96</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>26</TD><TD class=alignCenter>8</TD><TD class=alignCenter>12</TD><TD class=alignCenter>6</TD><TD class=alignCenter>5</TD><TD class=alignCenter>667</TD><TD class=alignCenter>142</TD><TD class=alignCenter>377</TD><TD class=alignCenter>148</TD><TD class=alignCenter>36</TD></TR><TR><TD>65+</TD><TD class=alignCenter>81</TD><TD class=alignCenter>0</TD><TD class=alignCenter>41</TD><TD class=alignCenter>40</TD><TD class=alignCenter>6</TD><TD class=alignCenter>2177</TD><TD class=alignCenter>36</TD><TD class=alignCenter>1813</TD><TD class=alignCenter>328</TD><TD class=alignCenter>47</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>226</TD><TD class=alignCenter>3</TD><TD class=alignCenter>221</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>183</TD><TD class=alignCenter>24</TD><TD class=alignCenter>83</TD><TD class=alignCenter>76</TD><TD class=alignCenter>74</TD><TD class=alignCenter>5246</TD><TD class=alignCenter>583</TD><TD class=alignCenter>3723</TD><TD class=alignCenter>940</TD><TD class=alignCenter>489</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 09, 18 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 1 from BC, 4 from AB, 6 from ON, 4 from QC, 1 from NS, and 2 from NL. This number is decreased compared to the previous week (week 08) in which 48 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.
Since the beginning of the season, 485 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 76 (15.7%) as influenza A/H3N2, 17 (3.5%) pandemic H1N1 2009, 318 (65.6%) as unsubytped influenza A, and 74 (15.3%) influenza B. The distribution of cases to date by age group was as follows: 18.1% among 0-5 month olds; 28.0% among 6-23 month olds; 29.5% among the 2-4 year-olds; 15.5% among 5-9 year-olds; and 8.9% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 09, 17 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number is decreased compared to the 21 cases reported in week 08 (note that numbers may fluctuate because of the delays in reporting). Of the 17 new cases reported between February 27 and March 5, 2011, 9 (52.9%) tested positive for unsubtyped influenza A, 2 (11.8%) as pandemic H1N1 2009, 3 (17.6%) as A/H3N2, and 3 (17.6%) as influenza B. Since the beginning of the season, 838 hospitalized cases have been reported: 188 (22.4%) A/H3N2, 36 (4.3%) pandemic H1N1 2009, 590 (70.4%) influenza A unsubtyped, and 24 (2.9%) influenza B, from all reporting provinces except NL. To date, 578 of the 838 (69.0%) cases were aged 65 years or older and 377 (45.0%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 09, 12 deaths with influenza were reported. Ten deaths were associated with A/H3N2 or unsubtyped influenza A in AB(1), ON(7), and NS(2), all in persons > 65 years old. Two deaths were reported from SK, one in a child between 1-4 years of age with A/H3N2 and the other in an adult between 45-64 years of age with pandemic H1N1 2009. Among the 177 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 61.6% (109/177), unsubtyped influenza A in 29.4% (52/177), pandemic H1N1 2009 in 6.8% (12/177), and influenza B in 2.3% (4/177). Seventy-nine percent (139/177) of these fatal cases were among persons 65 years of age or older, and another 11% (20/177) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

,,,/
http://www.phac-aspc.gc.ca/fluwatch/10-11/w09_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 10 - 185 deaths total

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 10 - 185 deaths total

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>March 6 to 12, 2011 (Week 10)

</TD></TR></TBODY></TABLE>

Posted 2011-03-18
Summary of FluWatch Findings for the Week ending March 12, 2011
  • In week 10, overall influenza activity is on the decline in many parts of the country. All influenza indicators including the number of outbreaks, the proportion of positive influenza detections, adult and paediatric hospitalizations, and the ILI consultation rate have declined this week.
  • Since the beginning of the season, 85% of the subtyped positive influenza A specimens have been influenza A/H3N2. Influenza B, circulating at low levels, has been slowly increasing since week 03 and now accounts for 28% of all influenza positive specimens. The percentage of positive RSV specimens has been decreasing over the last two weeks and appears to have peaked at week 07.

Overall Influenza Summary ? Week 10 (March 6 to 12, 2011)

In week 10, 17 regions reported localized activity (in BC(1), AB(1), SK(2), ON(6), QC(2), NB(2), NS(1), NL(1), and PE(1)), 29 regions reported sporadic activity (in all provinces and territories except NT and PE) and 10 regions presented no activity (see Activity level Map). Compared to the previous week (week 09), 4 regions reported an increased level of influenza activity, 14 regions reported decreased activity, and 31 regions maintained a stable level of influenza activity (sporadic or higher). Twenty-one new outbreaks were reported: 10 outbreaks of influenza in long-term care facilities (LTCF) in ON(1), QC(2), NB (2), NS(4) and PE(1); 8 ILI outbreaks in schools in AB(2), ON(1), NS(4) and PE(1); 1 pandemic H1N1 2009 outbreak in an adult residential facility in BC, and 2 ILI outbreaks in other settings in NB(1) and NL(1).

Map of overall Influenza activity level by province and territory, Canada, Week 10





No Data
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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
Text Equivalent

Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w10-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w10-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 10, the national ILI consultation rate was 25.3 consultations per 1,000 patient visits, which is a decrease from 37.4 in week 09 and slightly below the expected rate for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (52.2 per 1,000 consultations in week 10) followed by children between 5 and 19 years old (49.2 per 1,000).
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w10-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The proportion of tests that were positive for influenza during week 10 was 14.9%, a decrease from 15.9% in week 09. The proportion of positive tests peaked in week 52. Of the 833 positive tests reported during week 10, 282 (33.9%) specimens were reported as influenza A/H3N2, 66 (7.9%) as pandemic H1N1 2009, 284 (34.0%) as unsubtyped influenza A and 201 (24.1%) as influenza B. Since the beginning of the season, the majority of influenza virus detections have been influenza A viruses (93.1% or 14,970/16,080), and among subtyped influenza A specimens 85.5% have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, where it accounted for 3.4% of all positive influenza specimens to 24.1% in week 10. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.4% (1885/3666) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.2%, 604/641) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 10, the proportion of positive tests for respiratory syncytial virus detections (RSV) decreased slightly to 17.9% of specimens tested and appears to have peaked at week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (March 6 to March 12, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to March 12, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>55</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>28</TD><TD class=alignCenter>8</TD><TD class=alignCenter>19</TD><TD class=alignCenter>378</TD><TD class=alignCenter>0</TD><TD class=alignCenter>149</TD><TD class=alignCenter>131</TD><TD class=alignCenter>98</TD><TD class=alignCenter>104</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>89</TD><TD class=alignCenter>0</TD><TD class=alignCenter>59</TD><TD class=alignCenter>18</TD><TD class=alignCenter>12</TD><TD class=alignCenter>69</TD><TD class=alignCenter>826</TD><TD class=alignCenter>0</TD><TD class=alignCenter>594</TD><TD class=alignCenter>197</TD><TD class=alignCenter>35</TD><TD class=alignCenter>291</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1</TD><TD class=alignCenter>4</TD><TD class=alignCenter>7</TD><TD class=alignCenter>272</TD><TD class=alignCenter>0</TD><TD class=alignCenter>190</TD><TD class=alignCenter>24</TD><TD class=alignCenter>58</TD><TD class=alignCenter>21</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>514</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>1</TD><TD class=alignCenter>457</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>165</TD><TD class=alignCenter>0</TD><TD class=alignCenter>29</TD><TD class=alignCenter>5</TD><TD class=alignCenter>131</TD><TD class=alignCenter>56</TD><TD class=alignCenter>6583</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2379</TD><TD class=alignCenter>262</TD><TD class=alignCenter>3942</TD><TD class=alignCenter>402</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>141</TD><TD class=alignCenter>0</TD><TD class=alignCenter>32</TD><TD class=alignCenter>1</TD><TD class=alignCenter>108</TD><TD class=alignCenter>47</TD><TD class=alignCenter>5323</TD><TD class=alignCenter>0</TD><TD class=alignCenter>846</TD><TD class=alignCenter>33</TD><TD class=alignCenter>4444</TD><TD class=alignCenter>255</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>122</TD><TD class=alignCenter>0</TD><TD class=alignCenter>110</TD><TD class=alignCenter>9</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2</TD><TD class=alignCenter>768</TD><TD class=alignCenter>0</TD><TD class=alignCenter>559</TD><TD class=alignCenter>156</TD><TD class=alignCenter>53</TD><TD class=alignCenter>31</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>24</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>1</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>166</TD><TD class=alignCenter>0</TD><TD class=alignCenter>38</TD><TD class=alignCenter>9</TD><TD class=alignCenter>119</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>4</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>57</TD><TD class=alignCenter>0</TD><TD class=alignCenter>40</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>83</TD><TD class=alignCenter>0</TD><TD class=alignCenter>70</TD><TD class=alignCenter>4</TD><TD class=alignCenter>9</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>632</TD><TD class=alignCenter>0</TD><TD class=alignCenter>282</TD><TD class=alignCenter>66</TD><TD class=alignCenter>284</TD><TD class=alignCenter>201</TD><TD class=alignCenter>14970</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4921</TD><TD class=alignCenter>832</TD><TD class=alignCenter>9217</TD><TD class=alignCenter>1110</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(March 6 to March 12, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Mar. 12, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>28</TD><TD class=alignCenter>3</TD><TD class=alignCenter>20</TD><TD class=alignCenter>5</TD><TD class=alignCenter>18</TD><TD class=alignCenter>897</TD><TD class=alignCenter>110</TD><TD class=alignCenter>656</TD><TD class=alignCenter>131</TD><TD class=alignCenter>140</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>14</TD><TD class=alignCenter>3</TD><TD class=alignCenter>8</TD><TD class=alignCenter>3</TD><TD class=alignCenter>46</TD><TD class=alignCenter>450</TD><TD class=alignCenter>82</TD><TD class=alignCenter>265</TD><TD class=alignCenter>103</TD><TD class=alignCenter>245</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>45</TD><TD class=alignCenter>22</TD><TD class=alignCenter>11</TD><TD class=alignCenter>12</TD><TD class=alignCenter>19</TD><TD class=alignCenter>918</TD><TD class=alignCenter>259</TD><TD class=alignCenter>474</TD><TD class=alignCenter>185</TD><TD class=alignCenter>126</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>18</TD><TD class=alignCenter>6</TD><TD class=alignCenter>8</TD><TD class=alignCenter>4</TD><TD class=alignCenter>2</TD><TD class=alignCenter>677</TD><TD class=alignCenter>153</TD><TD class=alignCenter>386</TD><TD class=alignCenter>138</TD><TD class=alignCenter>38</TD></TR><TR><TD>65+</TD><TD class=alignCenter>40</TD><TD class=alignCenter>0</TD><TD class=alignCenter>35</TD><TD class=alignCenter>5</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2166</TD><TD class=alignCenter>37</TD><TD class=alignCenter>1885</TD><TD class=alignCenter>244</TD><TD class=alignCenter>57</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>223</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>147</TD><TD class=alignCenter>34</TD><TD class=alignCenter>83</TD><TD class=alignCenter>30</TD><TD class=alignCenter>92</TD><TD class=alignCenter>5337</TD><TD class=alignCenter>644</TD><TD class=alignCenter>3889</TD><TD class=alignCenter>804</TD><TD class=alignCenter>606</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Paediatric Influenza Hospitalizations and Deaths
In week 10, 21 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 7 from BC, 2 from AB, 3 from SK, 2 from ON, 5 from QC, 1 from NS, and 1 from NL. This number has decreased compared to the previous week (week 09) in which 31 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). So far this season, two deaths in children have been reported, both in Ontario. One, aged between 6 months and 23 months, who tested positive for pandemic H1N1 2009 was reported in week 48, and one aged 10-16 years, who tested positive for influenza A (unsubtyped), was reported in week 04.
Since the beginning of the season, 519 hospitalizations with laboratory-confirmed influenza have been reported from all provinces except NB and PE; 82 (15.8%) as influenza A/H3N2, 17 (3.3%) pandemic H1N1 2009, 328 (63.2%) as unsubytped influenza A, and 92 (17.7%) influenza B. The distribution of cases to date by age group was as follows: 17.7% among 0-5 month olds; 28.5% among 6-23 month olds; 29.7% among the 2-4 year-olds; 14.8% among 5-9 year-olds; and 9.2% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 10, 11 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has decreased compared to the 17 cases reported in week 09 (note that numbers may fluctuate because of the delays in reporting). Of the 11 new cases reported between March 6 and 12, 2011, 5 (45.5%) tested positive for unsubtyped influenza A, 2 (18.2%) as A/H3N2, 1 (9.1%) as pandemic H1N1 2009, and 3 (27.3%) as influenza B. Since the beginning of the season, 849 hospitalized cases have been reported: 190 (22.4%) A/H3N2, 37 (4.4%) pandemic H1N1 2009, 595 (70.1%) influenza A unsubtyped, and 27 (3.2%) influenza B, from all reporting provinces except NL. To date, 583 of the 849 (68.7%) cases were aged 65 years or older and 383 (45.1%) were males.

Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 10, one death with influenza was reported in Ontario, in a person 45 to 64 years of age with influenza A (unsubtyped). Among the 185 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 62.2% (115/185), unsubtyped influenza A in 29.2% (54/185), pandemic H1N1 2009 in 5.9% (11/185), and influenza B in 2.7% (5/185). Seventy-eight percent (145/185) of these fatal cases were among persons 65 years of age or older, and another 12% (22/185) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w10_11/index-eng.php
 
Canada FluWatch Weekly Reports 2010-2011 Season Week 11 - 191 deaths total (excluding BC, QC, NB and NU)

Canada FluWatch Weekly Reports 2010-2011 Season Week 11 - 191 deaths total (excluding BC, QC, NB and NU)

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>March 13 to 19, 2011 (Week 11)

</TD></TR></TBODY></TABLE>

Posted 2011-03-25


Overall Influenza Summary ? Week 11 (March 13 to 19, 2011)

In week 11, 3 regions reported widespread activity: BC(1), QC(1) and NL(1); 19 regions reported localized activity: BC(1), AB(3), SK(1), ON(7), QC(2), NB(2), NS(1), NL(1), and PE(1); 24 regions reported sporadic activity (in all provinces and territories except ON, NT and PE) and 10 regions presented no activity (see Activity level Map). Compared to the previous week (week 10), 12 regions reported an increased level of influenza activity, 8 regions reported decreased activity, and 30 regions maintained a stable level of influenza activity (sporadic or higher). Forty-one new outbreaks were reported: 13 outbreaks of influenza in long-term care facilities (LTCF) in BC(1), ON(2), QC(5), NB (2), and NS(3); 3 outbreaks of influenza B in schools in AB; 22 ILI outbreaks in schools in BC(5), AB(3), NB(1), NS(8), PE(1) and NL(4); one influenza A/H3N2 outbreak in a facility in PE, and 2 ILI outbreaks in other settings in NL.

Map of overall Influenza activity level by province and territory, Canada, Week 11





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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 11, the national ILI consultation rate was 24.0 consultations per 1,000 patient visits, which is decreased slightly compared to 25.5 in week 10 and within the expected rate for this time of year (see ILI graph). Children under 5 years of age and children between 5 and 19 years old had similar consultation rates (39.3 and 39.2 per 1,000 consultations, respectively) in week 11.
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The overall proportion of tests that were positive for influenza during week 11 was 12.6% (7.5% influenza A, 5.0% influenza B), a decrease from 15.0% in week 10. The proportion of positive tests peaked in week 52 (see Influenza tests graph). Of the 616 positive tests reported during week 11, 369 (59.9%) were influenza A and 247 (40.1%) were influenza B. Since the beginning of the season, 91.9% (15,346/16,704) of influenza virus detections have been influenza A viruses, of which 85.0% of subtyped specimens have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, where it accounted for 3.4% of all positive influenza specimens to 40.1% in week 11. Among influenza A detections in week 11, 147 (39.8%) specimens were reported as influenza A/H3N2, 49 (13.3%) as pandemic H1N1 2009, and 173 (46.9%) as unsubtyped influenza A. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.1% (1921/3761) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.5%, 635/672) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 11, the proportion of positive tests for respiratory syncytial virus detections (RSV) decreased slightly to 16.8% of specimens tested and appears to have peaked at week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (March 13 to March 19, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to March 19, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>37</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>13</TD><TD class=alignCenter>5</TD><TD class=alignCenter>38</TD><TD class=alignCenter>415</TD><TD class=alignCenter>0</TD><TD class=alignCenter>168</TD><TD class=alignCenter>144</TD><TD class=alignCenter>103</TD><TD class=alignCenter>142</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>45</TD><TD class=alignCenter>0</TD><TD class=alignCenter>28</TD><TD class=alignCenter>17</TD><TD class=alignCenter>0</TD><TD class=alignCenter>58</TD><TD class=alignCenter>878</TD><TD class=alignCenter>0</TD><TD class=alignCenter>626</TD><TD class=alignCenter>224</TD><TD class=alignCenter>28</TD><TD class=alignCenter>350</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>14</TD><TD class=alignCenter>278</TD><TD class=alignCenter>0</TD><TD class=alignCenter>192</TD><TD class=alignCenter>24</TD><TD class=alignCenter>62</TD><TD class=alignCenter>35</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>2</TD><TD class=alignCenter>457</TD><TD class=alignCenter>0</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>101</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>1</TD><TD class=alignCenter>84</TD><TD class=alignCenter>83</TD><TD class=alignCenter>6684</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2395</TD><TD class=alignCenter>263</TD><TD class=alignCenter>4026</TD><TD class=alignCenter>485</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>75</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>58</TD><TD class=alignCenter>52</TD><TD class=alignCenter>5398</TD><TD class=alignCenter>0</TD><TD class=alignCenter>861</TD><TD class=alignCenter>35</TD><TD class=alignCenter>4502</TD><TD class=alignCenter>307</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>63</TD><TD class=alignCenter>0</TD><TD class=alignCenter>40</TD><TD class=alignCenter>15</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>831</TD><TD class=alignCenter>0</TD><TD class=alignCenter>599</TD><TD class=alignCenter>171</TD><TD class=alignCenter>61</TD><TD class=alignCenter>31</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>13</TD><TD class=alignCenter>1</TD><TD class=alignCenter>179</TD><TD class=alignCenter>0</TD><TD class=alignCenter>38</TD><TD class=alignCenter>9</TD><TD class=alignCenter>132</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>69</TD><TD class=alignCenter>0</TD><TD class=alignCenter>52</TD><TD class=alignCenter>15</TD><TD class=alignCenter>2</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>16</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>99</TD><TD class=alignCenter>0</TD><TD class=alignCenter>85</TD><TD class=alignCenter>4</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>369</TD><TD class=alignCenter>0</TD><TD class=alignCenter>147</TD><TD class=alignCenter>49</TD><TD class=alignCenter>173</TD><TD class=alignCenter>247</TD><TD class=alignCenter>15346</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5072</TD><TD class=alignCenter>891</TD><TD class=alignCenter>9383</TD><TD class=alignCenter>1358</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(March 13 to March 19, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Mar. 19, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>14</TD><TD class=alignCenter>3</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD><TD class=alignCenter>24</TD><TD class=alignCenter>938</TD><TD class=alignCenter>113</TD><TD class=alignCenter>685</TD><TD class=alignCenter>140</TD><TD class=alignCenter>155</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>14</TD><TD class=alignCenter>5</TD><TD class=alignCenter>5</TD><TD class=alignCenter>4</TD><TD class=alignCenter>58</TD><TD class=alignCenter>471</TD><TD class=alignCenter>85</TD><TD class=alignCenter>272</TD><TD class=alignCenter>114</TD><TD class=alignCenter>265</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>23</TD><TD class=alignCenter>12</TD><TD class=alignCenter>7</TD><TD class=alignCenter>4</TD><TD class=alignCenter>12</TD><TD class=alignCenter>968</TD><TD class=alignCenter>277</TD><TD class=alignCenter>487</TD><TD class=alignCenter>204</TD><TD class=alignCenter>136</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>17</TD><TD class=alignCenter>9</TD><TD class=alignCenter>6</TD><TD class=alignCenter>2</TD><TD class=alignCenter>5</TD><TD class=alignCenter>711</TD><TD class=alignCenter>160</TD><TD class=alignCenter>396</TD><TD class=alignCenter>155</TD><TD class=alignCenter>41</TD></TR><TR><TD>65+</TD><TD class=alignCenter>31</TD><TD class=alignCenter>0</TD><TD class=alignCenter>21</TD><TD class=alignCenter>10</TD><TD class=alignCenter>9</TD><TD class=alignCenter>2279</TD><TD class=alignCenter>37</TD><TD class=alignCenter>1921</TD><TD class=alignCenter>321</TD><TD class=alignCenter>68</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>224</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>99</TD><TD class=alignCenter>29</TD><TD class=alignCenter>49</TD><TD class=alignCenter>21</TD><TD class=alignCenter>108</TD><TD class=alignCenter>5596</TD><TD class=alignCenter>675</TD><TD class=alignCenter>3985</TD><TD class=alignCenter>936</TD><TD class=alignCenter>665</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Antigenic Characterization
Between September 1 and March 24, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 435 influenza viruses that were received from provincial laboratories: 202 A/H3N2 from BC, AB, SK, MB, ON, QC, NB & NU, 90 pandemic H1N1 2009 from BC, AB, ON, QC, NB & NS and 143 B viruses from BC, AB, SK, ON, QC & NB. All 202 influenza A/H3N2 viruses characterized were antigenically related to A/Perth/16/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. The 90 pandemic H1N1 2009 viruses characterized were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. Of the 143 influenza B viruses characterized, 134 were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four of the 134 viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08. Nine influenza B viruses were characterized as B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. B/Wisconsin/01/2010-like viruses are antigenically and genetically different from the previous Yamagata lineage vaccine strain B/Florida/04/2006.
Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 421 influenza A isolates (325 A/H3N2 and 96 pandemic H1N1 2009) for amantadine resistance and found that 324 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 96 influenza A/H1N1 viruses were resistant to amantadine. Of 400 influenza viruses (177 A/H3N2, 89 pandemic H1N1 2009, and 135 influenza B) tested for resistance to oseltamivir, 176 A/H3N2 viruses were sensitive to oseltamivir and one was resistant to oseltamivir with E119V mutation. The resistant case was associated with oseltamivir prophylaxis/treatment. All 135 B viruses were sensitive to oseltamivir. Of the 89 pandemic H1N1 2009 isolates tested, 88 were sensitive to oseltamivir and one was resistant to oseltamivir with the H275Y mutation. The resistant case was associated with oseltamivir treatment. Of 396 influenza viruses (174 A/H3N2, 86 pandemic H1N1 2009, and 136 influenza B) tested for resistance to zanamivir, all isolates were found to be sensitive to zanamivir.
Severe Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths
In week 11, 24 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 6 from BC, 2 from SK, 6 from ON, 7 from QC, and 3 from NL. This number has decreased compared to the previous week (week 10) in which 32 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). Two influenza associated deaths were retrospectively reported in week 11; one child aged 6-23 months, who tested positive for influenza B (occurred in week 07); and the second child aged 2-4 years, who also tested positive for influenza B (occurred in week 10). So far this season, four deaths in children have been reported, all in Ontario.
Since the beginning of the season, 553 hospitalizations with laboratory-confirmed influenza have been reported from all participating provinces; 83 (15.0%) as influenza A/H3N2, 17 (3.1%) pandemic H1N1 2009, 341 (61.7%) as unsubytped influenza A, and 112 (20.3%) influenza B. The distribution of cases to date by age group was as follows: 17.2% among 0-5 month olds; 28.6% among 6-23 month olds; 29.5% among the 2-4 year-olds; 14.8% among 5-9 year-olds; and 9.9% among children 10-16 years old.
Adult Influenza Hospitalizations and Deaths
During week 11, 18 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has increased compared to the 11 cases reported in week 10 (note that numbers may fluctuate because of the delays in reporting). Of the 18 new cases reported between March 13 and 19, 2011, 10 (55.6%) tested positive for unsubtyped influenza A, 2 (11.1%) as pandemic H1N1 2009, 1 (5.6%) as A/H3N2, and 5 (27.8%) as influenza B. Since the beginning of the season, 893 hospitalized cases have been reported: 195 (21.8%) A/H3N2, 39 (4.4%) pandemic H1N1 2009, 624 (69.9%) influenza A unsubtyped, and 35 (3.9%) influenza B, from all reporting provinces except NL. To date, 609 of the 893 (68.2%) cases were aged 65 years or older and 403 (45.1%) were males.

Aggregate Influenza Hospitalizations and Deaths
Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 11, two deaths with influenza were reported in Ontario, one in a person over 65 years of age with influenza A/H3N2 and the other in a child 1-4 years old with influenza B. Among the 191 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 61.3% (117/191), unsubtyped influenza A in 28.8% (55/191), pandemic H1N1 2009 in 5.8% (11/191), and influenza B in 4.2% (8/191). Seventy-nine percent (150/191) of these fatal cases were among persons 65 years of age or older, and another 12% (22/191) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

.../
http://origin.phac-aspc.gc.ca/fluwatch/10-11/w11_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 12 - 196 deaths total (excluding BC, QC, NB and NU)

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 12 - 196 deaths total (excluding BC, QC, NB and NU)

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>March 20 to 26, 2011 (Week 12)

</TD></TR></TBODY></TABLE>

Posted 2011-04-01
Summary of FluWatch Findings for the Week ending March 26, 2011
  • In week 12, influenza B continues to increase steadily in most regions of the country except the Atlantic provinces. Of the 520 positive tests reported during week 12, 55.6% were influenza A and 44.4% were influenza B.
  • Influenza activity has declined in most of western Canada but persists in parts of Alberta, Ontario, Quebec and the Atlantic provinces. In week 12, the ILI consultation rate remained similar to the previous 2 weeks, fewer influenza/ILI outbreaks were reported, and both adult and paediatric hospitalizations decreased.
Overall Influenza Summary ? Week 12 (March 20 to 26, 2011)

In week 12, 1 region reported widespread activity in QC; 18 regions reported localized activity: AB(2), ON(5), QC(2), NB(3), NS(4), NL(1), and PE(1); 29 regions reported sporadic activity (in all provinces and territories except PE) and 8 regions presented no activity (see Activity level Map). Compared to the previous week (week 11), 10 regions reported an increased level of influenza activity, 12 regions reported decreased activity, and 28 regions maintained a stable level of influenza activity (sporadic or higher). Twenty-three new outbreaks were reported: 13 outbreaks of influenza in long-term care facilities (LTCF) in ON(3), QC(4), NB (1), NS(3), PE(1) and NL(1); 2 outbreaks of influenza B in schools in AB; 7 ILI outbreaks in schools in NB(2), NS(2), NL(3); and one ILI outbreak in a facility in NS.

Map of overall Influenza activity level by province and territory, Canada, Week 12





No Data
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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

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? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 12, the national ILI consultation rate was 23.4 consultations per 1,000 patient visits, which is decreased slightly compared to 25.9 in week 11 and within the expected rate for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (98.0 per 1,000 consultations) followed by children between 5 and 19 years old (53.8 per 1,000) in week 12.
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

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Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The overall proportion of tests that were positive for influenza during week 12 was 11.3% (6.3% influenza A, 5.0% influenza B), a decrease from 13.1% in week 11. The proportion of positive tests peaked in week 52 (see Influenza tests graph). Of the 520 positive tests reported during week 12, 289 (55.6%) were influenza A and 231 (44.4%) were influenza B. Since the beginning of the season, 90.7% (15,660/17,272) of influenza virus detections have been influenza A viruses, of which 84.8% of subtyped specimens have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, when it accounted for 3.4% of all positive influenza specimens to 44.4% in week 12. Among influenza A detections in week 12, 110 (38.1%) specimens were reported as influenza A/H3N2, 33 (11.4%) as pandemic H1N1 2009, and 146 (50.5%) as unsubtyped influenza A. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.2% (1927/3767) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.2%, 632/671) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 12, the proportion of positive tests for respiratory syncytial virus detections (RSV) was stable at 16.7% of specimens tested. The proportion of positive RSV tests appears to have peaked in week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (March 20 to March 26, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to March 26, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>9</TD><TD class=alignCenter>8</TD><TD class=alignCenter>16</TD><TD class=alignCenter>444</TD><TD class=alignCenter>0</TD><TD class=alignCenter>180</TD><TD class=alignCenter>153</TD><TD class=alignCenter>111</TD><TD class=alignCenter>158</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>49</TD><TD class=alignCenter>0</TD><TD class=alignCenter>27</TD><TD class=alignCenter>11</TD><TD class=alignCenter>11</TD><TD class=alignCenter>92</TD><TD class=alignCenter>952</TD><TD class=alignCenter>0</TD><TD class=alignCenter>672</TD><TD class=alignCenter>240</TD><TD class=alignCenter>40</TD><TD class=alignCenter>464</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>6</TD><TD class=alignCenter>2</TD><TD class=alignCenter>10</TD><TD class=alignCenter>290</TD><TD class=alignCenter>0</TD><TD class=alignCenter>196</TD><TD class=alignCenter>30</TD><TD class=alignCenter>64</TD><TD class=alignCenter>45</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>2</TD><TD class=alignCenter>457</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>53</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1</TD><TD class=alignCenter>47</TD><TD class=alignCenter>74</TD><TD class=alignCenter>6737</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2400</TD><TD class=alignCenter>264</TD><TD class=alignCenter>4073</TD><TD class=alignCenter>559</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>69</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>55</TD><TD class=alignCenter>31</TD><TD class=alignCenter>5467</TD><TD class=alignCenter>0</TD><TD class=alignCenter>875</TD><TD class=alignCenter>35</TD><TD class=alignCenter>4557</TD><TD class=alignCenter>338</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>44</TD><TD class=alignCenter>0</TD><TD class=alignCenter>20</TD><TD class=alignCenter>4</TD><TD class=alignCenter>20</TD><TD class=alignCenter>6</TD><TD class=alignCenter>875</TD><TD class=alignCenter>0</TD><TD class=alignCenter>619</TD><TD class=alignCenter>175</TD><TD class=alignCenter>81</TD><TD class=alignCenter>37</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>186</TD><TD class=alignCenter>0</TD><TD class=alignCenter>41</TD><TD class=alignCenter>10</TD><TD class=alignCenter>135</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>77</TD><TD class=alignCenter>0</TD><TD class=alignCenter>59</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>18</TD><TD class=alignCenter>0</TD><TD class=alignCenter>18</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>117</TD><TD class=alignCenter>0</TD><TD class=alignCenter>103</TD><TD class=alignCenter>4</TD><TD class=alignCenter>10</TD><TD class=alignCenter>1</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>289</TD><TD class=alignCenter>0</TD><TD class=alignCenter>110</TD><TD class=alignCenter>33</TD><TD class=alignCenter>146</TD><TD class=alignCenter>231</TD><TD class=alignCenter>15660</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5201</TD><TD class=alignCenter>929</TD><TD class=alignCenter>9530</TD><TD class=alignCenter>1612</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(March 20 to March 26, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Mar. 26, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>13</TD><TD class=alignCenter>3</TD><TD class=alignCenter>5</TD><TD class=alignCenter>5</TD><TD class=alignCenter>28</TD><TD class=alignCenter>928</TD><TD class=alignCenter>111</TD><TD class=alignCenter>681</TD><TD class=alignCenter>136</TD><TD class=alignCenter>160</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>11</TD><TD class=alignCenter>5</TD><TD class=alignCenter>3</TD><TD class=alignCenter>3</TD><TD class=alignCenter>32</TD><TD class=alignCenter>470</TD><TD class=alignCenter>84</TD><TD class=alignCenter>274</TD><TD class=alignCenter>112</TD><TD class=alignCenter>271</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>25</TD><TD class=alignCenter>8</TD><TD class=alignCenter>9</TD><TD class=alignCenter>8</TD><TD class=alignCenter>17</TD><TD class=alignCenter>967</TD><TD class=alignCenter>277</TD><TD class=alignCenter>487</TD><TD class=alignCenter>203</TD><TD class=alignCenter>139</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>12</TD><TD class=alignCenter>5</TD><TD class=alignCenter>4</TD><TD class=alignCenter>3</TD><TD class=alignCenter>9</TD><TD class=alignCenter>712</TD><TD class=alignCenter>160</TD><TD class=alignCenter>398</TD><TD class=alignCenter>154</TD><TD class=alignCenter>42</TD></TR><TR><TD>65+</TD><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>9</TD><TD class=alignCenter>6</TD><TD class=alignCenter>10</TD><TD class=alignCenter>2287</TD><TD class=alignCenter>39</TD><TD class=alignCenter>1927</TD><TD class=alignCenter>321</TD><TD class=alignCenter>70</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>224</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>76</TD><TD class=alignCenter>21</TD><TD class=alignCenter>30</TD><TD class=alignCenter>25</TD><TD class=alignCenter>96</TD><TD class=alignCenter>5593</TD><TD class=alignCenter>674</TD><TD class=alignCenter>3991</TD><TD class=alignCenter>928</TD><TD class=alignCenter>682</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Antigenic Characterization
Between September 1 and March 31, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 493 influenza viruses that were received from provincial laboratories: 213 A/H3N2 from BC, AB, SK, MB, ON, QC, NB & NU, 95 pandemic H1N1 2009 from BC, AB, ON, QC, NB & NS and 185 B viruses from BC, AB, SK, ON, QC & NB. Of the 213 influenza A/H3N2 viruses characterized, 210 (98.6%) were antigenically related to A/Perth/16/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. Three viruses (1.4%) tested showed reduced titer with antiserum produced against A/Perth/16/2009. Of the 95 pandemic H1N1 2009 viruses characterized, 94 (98.9%) were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. One virus (1.1%) tested showed reduced titer with antiserum produced against A/California/7/2009. Of the 185 influenza B viruses characterized, 176 were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four of the 176 viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08. Nine influenza B viruses were characterized as B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. B/Wisconsin/01/2010-like viruses are antigenically and genetically different from the previous Yamagata lineage vaccine strain B/Florida/04/2006.
Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 455 influenza A isolates (358 A/H3N2 and 97 pandemic H1N1 2009) for amantadine resistance and found that 357 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 97 influenza A/H1N1 viruses were resistant to amantadine. Of 442 influenza viruses (188 A/H3N2, 94 pandemic H1N1 2009, and 160 influenza B) tested for resistance to oseltamivir, 187 A/H3N2 viruses were sensitive to oseltamivir and one was resistant to oseltamivir with E119V mutation. The resistant case was associated with oseltamivir prophylaxis/treatment. Of the 94 pandemic H1N1 2009 isolates tested, 93 were sensitive to oseltamivir and one was resistant to oseltamivir with the H275Y mutation. The resistant case was associated with oseltamivir treatment. All 160 B viruses were sensitive to oseltamivir. Of 435 influenza viruses (183 A/H3N2, 91 pandemic H1N1 2009, and 161 influenza B) tested for resistance to zanamivir, all isolates were found to be sensitive to zanamivir.

Severe Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths
In week 12, 17 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 3 from BC, 5 from AB, 4 from ON, 4 from QC, and 1 from NS. This number has decreased compared to the previous week (week 11) in which 30 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). To date this season, four deaths in children have been reported, all in Ontario: two children were between 6 and 23 months old, one with pandemic H1N1 2009 and one with influenza B; one child was between 2 and 4 years old with influenza B; and one child was between 10 and 16 years old with unsubtyped influenza A.

Since the beginning of the season, 576 hospitalizations with laboratory-confirmed influenza have been reported from all participating provinces; 84 (14.6%) as influenza A/H3N2, 18 (3.1%) pandemic H1N1 2009, 349 (60.6%) as unsubytped influenza A, and 125 (21.7%) influenza B. The distribution of cases to date by age group was as follows: 17.4% among 0-5 month olds; 28.6% among 6-23 month olds; 29.0% among the 2-4 year-olds; 14.4% among 5-9 year-olds; and 10.6% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 12, 12 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has decreased compared to the 18 cases reported in week 11 (note that numbers may fluctuate because of the delays in reporting). Of the 12 new cases reported between March 20 and 26, 2011, 4 (33.3%) tested positive for unsubtyped influenza A, 1 (8.3%) as pandemic H1N1 2009, 2 (16.7%) as A/H3N2, and 5 (41.7%) as influenza B. Since the beginning of the season, 918 hospitalized cases have been reported: 199 (21.7%) A/H3N2, 41 (4.5%) pandemic H1N1 2009, 630 (68.6%) influenza A unsubtyped, and 48 (5.2%) influenza B, from all reporting provinces except NL. To date, 624 of the 918 (68.0%) cases were aged 65 years or older and 416 (45.3%) were males.

Aggregate Influenza Hospitalizations and Deaths
Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 12, four deaths with influenza were reported, one in Ontario in a person over 65 years of age with influenza B, one in Nova Scotia in a person over 65 years of age with influenza A/H3N2, and the 2 others in PEI both in persons over 65 years of age with A/H3N2. Among the 196 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 60.7% (119/196), unsubtyped influenza A in 28.1% (55/196), pandemic H1N1 2009 in 6.1% (12/196), and influenza B in 5.1% (10/196). Seventy-nine percent (154/196) of these fatal cases were among persons 65 years of age or older, and another 12% (23/196) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w12_11/index-eng.php
 
Canada FluWatch Weekly Reports 2010-2011 Season Week 13 - 208 deaths total (excluding BC, QC, NB and NU)

Canada FluWatch Weekly Reports 2010-2011 Season Week 13 - 208 deaths total (excluding BC, QC, NB and NU)

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>March 27 to April 2, 2011 (Week 13)

</TD></TR></TBODY></TABLE>

Posted 2011-04-08
Summary of FluWatch Findings for the Week ending April 2, 2011
  • In week 13, localized influenza activity is being reported in parts of Saskatchewan, Ontario, Quebec and the Atlantic provinces.
  • Influenza B detections continue to increase steadily in most regions of the country except the Atlantic provinces and now accounts for almost half of the positive tests for influenza (53.0% influenza A, 47.0% were influenza B).
  • In week 13, the ILI consultation rate remained similar to the previous 3 weeks, fewer influenza/ILI outbreaks were reported, and adult hospitalizations decreased compared to the previous week.
Overall Influenza Summary ? Week 13 (March 27 to April 2, 2011)

In week 13, 12 regions reported localized activity: SK(1), ON(5), QC(1), NB(1), NS(3), and PE(1); 29 regions reported sporadic activity (in all provinces and territories except PE, NS, and YK ) and 15 regions presented no activity (see Activity level Map). Compared to the previous week (week 12), 5 regions reported an increased level of influenza activity, 17 regions reported decreased activity, and 27 regions maintained a stable level of influenza activity (sporadic or higher). Twelve new outbreaks were reported: 4 outbreaks of influenza in long-term care facilities (LTCF) in ON(2), NB (1), and PE(1); 3 outbreaks of influenza in hospitals in QC(1) and NS(2); 3 ILI outbreaks in schools in NB(1), and NS(2); and 2 ILI outbreaks in other facilities in ON.

Map of overall Influenza activity level by province and territory, Canada, Week 13





No Data
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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w13-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

2011-w13-fg2-eng.gif

Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 13, the national ILI consultation rate was 24.1 consultations per 1,000 patient visits, which has been similar to the past 3 weeks and within the expected rate for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (77.0 per 1,000 consultations) in week 13.
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w13-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
Text Equivalent
Laboratory Surveillance Summary
The overall proportion of tests that were positive for influenza during week 13 was 11.4% (6.0% influenza A, 5.3% influenza B), similar to that of week 12 (11.2%). The proportion of positive tests peaked in week 52 (see Influenza tests graph). Of the 481 positive tests reported during week 13, 255 (53.0%) were influenza A and 226 (47.0%) were influenza B. Since the beginning of the season, 89.6% (15,914/17,753) of influenza virus detections have been influenza A viruses, of which 84.8% (5,282/6230) of subtyped specimens have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, when it accounted for 3.4% of all positive influenza specimens to 47.0% in week 13. Among influenza A detections in week 13, 78 (30.6%) specimens were reported as influenza A/H3N2, 17 (6.7%) as pandemic H1N1 2009, and 160 (62.7%) as unsubtyped influenza A. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.2% (1935/3776) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.0%, 631/671) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 13, the proportion of positive tests for respiratory syncytial virus detections (RSV) decreased from 17.1% to 12.8% of specimens tested. The proportion of positive RSV tests appears to have peaked in week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (March 27 to April 2, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to April 2, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>9</TD><TD class=alignCenter>1</TD><TD class=alignCenter>8</TD><TD class=alignCenter>465</TD><TD class=alignCenter>0</TD><TD class=alignCenter>191</TD><TD class=alignCenter>162</TD><TD class=alignCenter>112</TD><TD class=alignCenter>166</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>29</TD><TD class=alignCenter>0</TD><TD class=alignCenter>17</TD><TD class=alignCenter>5</TD><TD class=alignCenter>7</TD><TD class=alignCenter>71</TD><TD class=alignCenter>980</TD><TD class=alignCenter>0</TD><TD class=alignCenter>692</TD><TD class=alignCenter>247</TD><TD class=alignCenter>41</TD><TD class=alignCenter>536</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>17</TD><TD class=alignCenter>295</TD><TD class=alignCenter>0</TD><TD class=alignCenter>198</TD><TD class=alignCenter>30</TD><TD class=alignCenter>67</TD><TD class=alignCenter>62</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>2</TD><TD class=alignCenter>457</TD><TD class=alignCenter>2</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>77</TD><TD class=alignCenter>0</TD><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>76</TD><TD class=alignCenter>6814</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2421</TD><TD class=alignCenter>264</TD><TD class=alignCenter>4129</TD><TD class=alignCenter>635</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>54</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>54</TD><TD class=alignCenter>50</TD><TD class=alignCenter>5521</TD><TD class=alignCenter>0</TD><TD class=alignCenter>875</TD><TD class=alignCenter>35</TD><TD class=alignCenter>4611</TD><TD class=alignCenter>388</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter> </TD><TD class=alignCenter> </TD><TD class=alignCenter> </TD><TD class=alignCenter> </TD><TD class=alignCenter> </TD><TD class=alignCenter> </TD><TD class=alignCenter>875</TD><TD class=alignCenter>0</TD><TD class=alignCenter>619</TD><TD class=alignCenter>175</TD><TD class=alignCenter>81</TD><TD class=alignCenter>37</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>31</TD><TD class=alignCenter>0</TD><TD class=alignCenter>15</TD><TD class=alignCenter>1</TD><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>217</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>11</TD><TD class=alignCenter>150</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>89</TD><TD class=alignCenter>0</TD><TD class=alignCenter>71</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>26</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>24</TD><TD class=alignCenter>3</TD><TD class=alignCenter>143</TD><TD class=alignCenter>0</TD><TD class=alignCenter>103</TD><TD class=alignCenter>6</TD><TD class=alignCenter>34</TD><TD class=alignCenter>4</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>255</TD><TD class=alignCenter>0</TD><TD class=alignCenter>78</TD><TD class=alignCenter>17</TD><TD class=alignCenter>160</TD><TD class=alignCenter>226</TD><TD class=alignCenter>15914</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5282</TD><TD class=alignCenter>948</TD><TD class=alignCenter>9684</TD><TD class=alignCenter>1839</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(March 27 to April 2, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Apr. 2, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>5</TD><TD class=alignCenter>20</TD><TD class=alignCenter>928</TD><TD class=alignCenter>111</TD><TD class=alignCenter>681</TD><TD class=alignCenter>136</TD><TD class=alignCenter>159</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>18</TD><TD class=alignCenter>470</TD><TD class=alignCenter>84</TD><TD class=alignCenter>274</TD><TD class=alignCenter>112</TD><TD class=alignCenter>271</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>16</TD><TD class=alignCenter>8</TD><TD class=alignCenter>5</TD><TD class=alignCenter>3</TD><TD class=alignCenter>16</TD><TD class=alignCenter>967</TD><TD class=alignCenter>277</TD><TD class=alignCenter>487</TD><TD class=alignCenter>203</TD><TD class=alignCenter>139</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>4</TD><TD class=alignCenter>6</TD><TD class=alignCenter>711</TD><TD class=alignCenter>159</TD><TD class=alignCenter>399</TD><TD class=alignCenter>153</TD><TD class=alignCenter>42</TD></TR><TR><TD>65+</TD><TD class=alignCenter>47</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>31</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2288</TD><TD class=alignCenter>40</TD><TD class=alignCenter>1935</TD><TD class=alignCenter>313</TD><TD class=alignCenter>70</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>224</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>87</TD><TD class=alignCenter>8</TD><TD class=alignCenter>35</TD><TD class=alignCenter>44</TD><TD class=alignCenter>67</TD><TD class=alignCenter>5593</TD><TD class=alignCenter>674</TD><TD class=alignCenter>4000</TD><TD class=alignCenter>919</TD><TD class=alignCenter>681</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Antigenic Characterization
Between September 1 and April 5, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 562 influenza viruses that were received from provincial laboratories: 216 A/H3N2 from BC, AB, SK, MB, ON, QC, NB & NU, 101 pandemic H1N1 2009 from BC, AB, ON, QC, NB & NS and 245 B viruses from BC, AB, SK, ON, QC, NB, NT and NU. Of the 216 influenza A/H3N2 viruses characterized, 213 (98.6%) were antigenically related to A/Perth/16/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. Three viruses (1.4%) tested showed reduced titer with antiserum produced against A/Perth/16/2009. Of the 101 pandemic H1N1 2009 viruses characterized, 94 (99%) were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. One virus (1%) tested showed reduced titer with antiserum produced against A/California/7/2009. Of the 245 influenza B viruses characterized, 236 were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four of the 236 viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08. Nine influenza B viruses were characterized as B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. B/Wisconsin/01/2010-like viruses are antigenically and genetically different from the previous Yamagata lineage vaccine strain B/Florida/04/2006.
Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 494 influenza A isolates (382 A/H3N2 and 112 pandemic H1N1 2009) for amantadine resistance and found that 381 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 112 influenza A/H1N1 viruses were resistant to amantadine. Of 442 influenza viruses (188 A/H3N2, 94 pandemic H1N1 2009, and 160 influenza B) tested for resistance to oseltamivir, 187 A/H3N2 viruses were sensitive to oseltamivir and one was resistant to oseltamivir with E119V mutation. The resistant case was associated with oseltamivir prophylaxis/treatment. Of the 94 pandemic H1N1 2009 isolates tested, 93 were sensitive to oseltamivir and one was resistant to oseltamivir with the H275Y mutation. The resistant case was associated with oseltamivir treatment. All 160 B viruses were sensitive to oseltamivir. Of 435 influenza viruses (183 A/H3N2, 91 pandemic H1N1 2009, and 161 influenza B) tested for resistance to zanamivir, all isolates were found to be sensitive to zanamivir.
Severe Illness Surveillance

Paediatric Influenza Hospitalizations and Deaths
In week 13, 21 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 2 from BC, 6 from AB, 5 from ON, 5 from QC, 1 from NS and 2 from NL. This number has increased compared to the previous week (week 12) in which 17 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). A death was reported in week 14 (3-9 April 2011) of a child between 6 and 23 months old with unsubtyped influenza A in Alberta. This is the 5th paediatric death reported via IMPACT this season. The four previous deaths occurred in Ontario: 2 children were between 6 and 23 months old, one with pandemic H1N1 2009, and one with influenza B; one child was between 2 and 4 years old with influenza B; and one child was between 10 and 16 years old with unsubtyped influenza A. All cases had underlying comorbidities.
Since the beginning of the season, 593 hospitalizations with laboratory-confirmed influenza have been reported from all participating provinces; 99 (16.7%) as influenza A/H3N2, 21 (3.5%) pandemic H1N1 2009, 333 (56.2%) as unsubytped influenza A, and 140 (23.6%) influenza B. The distribution of cases to date by age group was as follows: 17.2% among 0-5 month olds; 28.7% among 6-23 month olds; 28.5% among the 2-4 year-olds; 14.8% among 5-9 year-olds; and 10.8% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 13, 10 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has decreased compared to the 14 cases reported in week 12 (note that numbers may fluctuate because of the delays in reporting). Of the 10 new cases reported between March 27 and April 2, 2011, 2 (20.0%) tested positive for unsubtyped influenza A, 1 (10.0%) as pandemic H1N1 2009, and 7 (70.0%) as influenza B. Since the beginning of the season, 929 hospitalized cases have been reported: 199 (21.4%) A/H3N2, 42 (4.5%) pandemic H1N1 2009, 634 (68.2%) influenza A unsubtyped, and 54 (5.8%) influenza B, from all reporting provinces except NL. To date, 628 of the 929 (67.6%) cases were aged 65 years or older and 420 (45.2%) were males.

Aggregate Influenza Hospitalizations and Deaths
Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 13, five deaths with influenza were reported: one in Alberta in a person 20-45 years of age with pandemic H1N1 2009; two in Ontario, both with unsubtyped influenza A, in persons 5-19 years old and over 65 years of age; and one each in PEI and Nova Scotia in persons over 65 years of age with influenza A/H3N2. Among the 208 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 60.6% (126/208), unsubtyped influenza A in 28.4% (59/208), pandemic H1N1 2009 in 6.3% (13/208), and influenza B in 4.8% (10/208). Seventy-nine percent (164/208) of these fatal cases were among persons 65 years of age or older, and another 11% (23/208) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w13_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 14 - 217 deaths total (excluding BC, QC, NB and NU)

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 14 - 217 deaths total (excluding BC, QC, NB and NU)

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>April 3 to 9, 2011 (Week 14)


</TD></TR></TBODY></TABLE></B>
Posted 2011-04-15


Overall Influenza Summary
  • In week 14, all indicators of influenza activity have decreased.
  • Ten percent of tests were positive for influenza, of which influenza B accounted for a greater proportion than influenza A.
  • The ILI consultation rate declined compared to previous weeks and is slightly below the expected rate for this time of year. Fewer influenza/ILI outbreaks were reported, and both adult and paediatric hospitalizations decreased compared to the previous week.
Note: The next FluWatch report will be published on Thursday, April 21<SUP>st </SUP>due to the Good Friday holiday. FluWatch will return to Friday publication on April 29<SUP>th </SUP>.
Influenza Activity and Outbreaks

In week 14, 9 regions reported localized activity: AB(1), ON(4), NB(2), NS(1), and NL(1); 33 regions reported sporadic activity (in all provinces and territories except YK) and 14 regions presented no activity (see Activity level Map). Compared to the previous week (week 13), 7 regions reported an increased level of influenza activity, 9 regions reported decreased activity, and 28 regions maintained a stable level of influenza activity (sporadic or higher). Eleven new outbreaks were reported: 6 outbreaks of influenza in long-term care facilities (LTCF) in AB(1) ON(1), NB (2), and NS(2); 2 outbreaks of influenza in hospitals in NS; 2 ILI outbreaks in schools in NB; and 1 ILI outbreak in a facility in NL.

Map of overall Influenza activity level by province and territory, Canada, Week 14





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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
Text Equivalent

Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w14-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
Text Equivalent


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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 14, the national ILI consultation rate was 17.2 consultations per 1,000 patient visits, which is decreased compared to previous weeks and is slightly below the expected rate for this time of year (see ILI graph). Children 5-19 years of age had the highest consultation rates (32.8 per 1,000 consultations), followed by children under 5 years of age (22.5 per 1,000 consultations) in week 14.
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w14-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
Text Equivalent
Laboratory Surveillance Summary
The overall proportion of tests that were positive for influenza during week 14 was 10.4% (4.3% influenza A, 6.1% influenza B), which is decreased compared to week 13 (11.7%) and the first week in which more influenza B detections were reported than influenza A. The proportion of positive tests peaked in week 52 (see Influenza tests graph). Of the 412 positive tests reported during week 14, 169 (41.0%) were influenza A and 243 (59.0%) were influenza B. Since the beginning of the season, 88.5% (16,106/18,197) of influenza virus detections have been influenza A viruses, of which 84.7% (5,351/6,317) of subtyped specimens have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, when it accounted for 3.4% of all positive influenza specimens to 59.0% in week 14. Among influenza A detections in week 14, 54 (32.0%) specimens were reported as influenza A/H3N2, 12 (7.1%) as pandemic H1N1 2009, and 103 (60.9%) as unsubtyped influenza A. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 51.3% (1937/3779) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.0%, 632/672) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 14, the proportion of positive tests for respiratory syncytial virus detections (RSV) increased slightly to 14.3% of specimens tested. The proportion of positive RSV tests appears to have peaked in week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.

</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (April 3 to April 9, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to April 9, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>8</TD><TD class=alignCenter>472</TD><TD class=alignCenter>0</TD><TD class=alignCenter>196</TD><TD class=alignCenter>163</TD><TD class=alignCenter>113</TD><TD class=alignCenter>174</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>31</TD><TD class=alignCenter>0</TD><TD class=alignCenter>19</TD><TD class=alignCenter>9</TD><TD class=alignCenter>3</TD><TD class=alignCenter>77</TD><TD class=alignCenter>1012</TD><TD class=alignCenter>0</TD><TD class=alignCenter>714</TD><TD class=alignCenter>261</TD><TD class=alignCenter>37</TD><TD class=alignCenter>615</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>36</TD><TD class=alignCenter>297</TD><TD class=alignCenter>0</TD><TD class=alignCenter>199</TD><TD class=alignCenter>30</TD><TD class=alignCenter>68</TD><TD class=alignCenter>98</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>2</TD><TD class=alignCenter>457</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>31</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>25</TD><TD class=alignCenter>44</TD><TD class=alignCenter>6845</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2427</TD><TD class=alignCenter>264</TD><TD class=alignCenter>4154</TD><TD class=alignCenter>679</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>46</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>43</TD><TD class=alignCenter>73</TD><TD class=alignCenter>5567</TD><TD class=alignCenter>0</TD><TD class=alignCenter>876</TD><TD class=alignCenter>37</TD><TD class=alignCenter>4654</TD><TD class=alignCenter>461</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>N/A</TD><TD class=alignCenter>N/A</TD><TD class=alignCenter>N/A</TD><TD class=alignCenter>N/A</TD><TD class=alignCenter>N/A</TD><TD class=alignCenter>N/A</TD><TD class=alignCenter>897</TD><TD class=alignCenter>0</TD><TD class=alignCenter>631</TD><TD class=alignCenter>176</TD><TD class=alignCenter>90</TD><TD class=alignCenter>44</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>0</TD><TD class=alignCenter>237</TD><TD class=alignCenter>0</TD><TD class=alignCenter>70</TD><TD class=alignCenter>11</TD><TD class=alignCenter>156</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>97</TD><TD class=alignCenter>0</TD><TD class=alignCenter>79</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>24</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>24</TD><TD class=alignCenter>1</TD><TD class=alignCenter>167</TD><TD class=alignCenter>0</TD><TD class=alignCenter>103</TD><TD class=alignCenter>6</TD><TD class=alignCenter>58</TD><TD class=alignCenter>5</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>169</TD><TD class=alignCenter>0</TD><TD class=alignCenter>54</TD><TD class=alignCenter>12</TD><TD class=alignCenter>103</TD><TD class=alignCenter>243</TD><TD class=alignCenter>16106</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5351</TD><TD class=alignCenter>966</TD><TD class=alignCenter>9789</TD><TD class=alignCenter>2091</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.

</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(April 3 to April 9, 2011)
</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Apr. 9, 2011)

</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>5</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>2</TD><TD class=alignCenter>24</TD><TD class=alignCenter>929</TD><TD class=alignCenter>111</TD><TD class=alignCenter>682</TD><TD class=alignCenter>136</TD><TD class=alignCenter>160</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>3</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>16</TD><TD class=alignCenter>469</TD><TD class=alignCenter>84</TD><TD class=alignCenter>273</TD><TD class=alignCenter>112</TD><TD class=alignCenter>275</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>11</TD><TD class=alignCenter>4</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>14</TD><TD class=alignCenter>967</TD><TD class=alignCenter>277</TD><TD class=alignCenter>487</TD><TD class=alignCenter>203</TD><TD class=alignCenter>140</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>6</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>3</TD><TD class=alignCenter>15</TD><TD class=alignCenter>712</TD><TD class=alignCenter>160</TD><TD class=alignCenter>400</TD><TD class=alignCenter>152</TD><TD class=alignCenter>43</TD></TR><TR><TD>65+</TD><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>15</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2291</TD><TD class=alignCenter>40</TD><TD class=alignCenter>1937</TD><TD class=alignCenter>314</TD><TD class=alignCenter>73</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>224</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>46</TD><TD class=alignCenter>6</TD><TD class=alignCenter>19</TD><TD class=alignCenter>21</TD><TD class=alignCenter>76</TD><TD class=alignCenter>5597</TD><TD class=alignCenter>675</TD><TD class=alignCenter>4003</TD><TD class=alignCenter>919</TD><TD class=alignCenter>691</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Antigenic Characterization
Between September 1 and April 14, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 632 influenza viruses that were received from provincial laboratories: 228 A/H3N2, 109 pandemic H1N1 2009 and 295 B viruses. Of the 228 influenza A/H3N2 viruses characterized, 225 (98.7%) were antigenically related to A/Perth/16/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. Three viruses (1.3%) tested showed reduced titer with antiserum produced against A/Perth/16/2009. Of the 109 pandemic H1N1 2009 viruses characterized, 108 (99%) were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. One virus (1%) tested showed reduced titer with antiserum produced against A/California/7/2009. Of the 295 influenza B viruses characterized, 280 were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four of the 280 viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08. Fifteen influenza B viruses were characterized as B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. B/Wisconsin/01/2010-like viruses are antigenically and genetically different from the previous Yamagata lineage vaccine strain B/Florida/04/2006.
Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 512 influenza A isolates (399 A/H3N2 and 113 pandemic H1N1 2009) for amantadine resistance and found that 398 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 113 influenza A/H1N1 viruses were resistant to amantadine. Of 565 influenza viruses (205 A/H3N2, 103 pandemic H1N1 2009, and 257 influenza B) tested for resistance to oseltamivir, 204 A/H3N2 viruses were sensitive to oseltamivir and one was resistant to oseltamivir with E119V mutation. The resistant case was associated with oseltamivir prophylaxis/treatment. Of the 103 pandemic H1N1 2009 isolates tested, 102 were sensitive to oseltamivir and one was resistant to oseltamivir with the H275Y mutation. The resistant case was associated with oseltamivir treatment. All 257 B viruses were sensitive to oseltamivir. Of 558 influenza viruses (200 A/H3N2, 100 pandemic H1N1 2009, and 258 influenza B) tested for resistance to zanamivir, all isolates were found to be sensitive to zanamivir.
Severe Illness Surveillance

Paediatric Influenza Hospitalizations and Deaths
In week 14, 22 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 3 from BC, 4 from AB, 1 from SK, 13 from QC, and 1 from NL. This number has decreased slightly compared to the previous week (week 13) in which 25 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). Five paediatric death have been reported via IMPACT this season all with underlying comorbidities.
Since the beginning of the season, 618 hospitalizations with laboratory-confirmed influenza have been reported from all participating provinces; 100 (16.2%) as influenza A/H3N2, 22 (3.6%) pandemic H1N1 2009, 333 (53.9%) as unsubytped influenza A, and 163 (26.4%) influenza B. The distribution of cases to date by age group was as follows: 16.8% among 0-5 month olds; 28.3% among 6-23 month olds; 29.1% among the 2-4 year-olds; 14.9% among 5-9 year-olds; and 10.8% among children 10-16 years old.
Adult Influenza Hospitalizations and Deaths
During week 14, 7 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has decreased compared to the 11 cases reported in week 13 (note that numbers may fluctuate because of the delays in reporting). Of the 7 new cases reported between April 3 and 9, 2011, 2 (28.6%) tested positive for unsubtyped influenza A, 1 (14.3%) as A/H3N2, and 4 (57.1%) as influenza B. Since the beginning of the season, 943 hospitalized cases have been reported: 201 (21.3%) A/H3N2, 45 (4.8%) pandemic H1N1 2009, 637 (67.6%) influenza A unsubtyped, and 60 (6.4%) influenza B, from all reporting provinces. To date, 638 of the 943 (67.7%) cases were aged 65 years or older and 425 (45.1%) were males.

Aggregate Influenza Hospitalizations and Deaths
Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 14, three deaths with influenza were reported in Ontario: in persons 45-64 and >65 years old with influenza A/H3N2 or unsubtyped influenza A. Among the 217 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 61.8% (134/217), unsubtyped influenza A in 27.6% (60/217), pandemic H1N1 2009 in 6.0% (13/217), and influenza B in 4.6% (10/217). Seventy-nine percent (172/217) of these fatal cases were among persons 65 years of age or older, and another 11% (24/217) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w14_11/index-eng.php
 
Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 15 - 218 deaths total (excluding BC, QC, NB and NU)

Re: Canada FluWatch Weekly Reports 2010-2011 Season Week 15 - 218 deaths total (excluding BC, QC, NB and NU)

<TABLE border=0 cellSpacing=0 cellPadding=0><TBODY><TR><TD>April 10 to 16, 2011 (Week 15)

</TD></TR></TBODY></TABLE>

Posted 2011-04-21
Overall Influenza Summary
  • In week 15, influenza B continues to increase and accounted for 63% of positive influenza detections.
  • A few more regions reported localized influenza activity this week compared to the previous week.
  • ILI consultation rate increased slightly, however all other indicators of influenza activity decreased.

Influenza Activity and Outbreaks

In week 15, 15 regions reported localized activity: AB(1), SK(1), ON(5), QC(1), NB(2), NS(3), and NL(2); 26 regions reported sporadic activity (in BC(5), AB(4), SK(2), MB(2), QC(5), NB(4), NT(2), and NU(2)) and 13 regions presented no activity (see Activity level Map). Compared to the previous week (week 14), 10 regions reported an increased level of influenza activity, 12 regions reported decreased activity, and 24 regions maintained a stable level of influenza activity (sporadic or higher). Nine new outbreaks were reported: 6 outbreaks of influenza in long-term care facilities (LTCF) in SK(1), QC(1), NL (1), and PE(3); and 3 ILI outbreaks in schools in AB(1), NS(1), and NL(1).

Map of overall Influenza activity level by province and territory, Canada, Week 15

[URL="http://dsol-smed.phac-aspc.gc.ca/dsol-smed/fluwatch/fluwatch.phtml?FluWeek=wk201115&Submit=View+Map&province=wb&lang=e"][/URL]



No Data
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No Activity
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Sporadic Activity
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Localized Activity
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Widespread Activity
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Note: Influenza activity levels, as represented on this map, are assigned and reported by Provincial and Territorial Ministries of Health, based on laboratory confirmations, sentinel ILI rates (see graphs and tables) and reported outbreaks. Please refer to detailed definitions on the last page. For areas where no data is reported, late reports from these provinces and territories will appear on the FluWatch website.
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Number of influenza surveillance regions<SUP title="sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in">?</SUP> reporting widespread or localized influenza activity, Canada, by report week, 2010-2011 (N=56)

2011-w15-fg1-eng.gif

? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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Overall Number of Influenza Outbreaks, Canada, by Report Week, 2010-2011

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Note that this was the first year that all the provinces and territories were reporting on influenza outbreaks in schools (greater than 10% absenteeism on any day most likely due to ILI) which has increased considerably the total number of outbreaks reported compared to previous years.
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ILI consultation rate
During week 15, the national ILI consultation rate was 19.3 consultations per 1,000 patient visits, which is increased compared to the previous week and is within the expected rate for this time of year (see ILI graph). Children under 5 years of age had the highest consultation rates (57.2 per 1,000 consultations), followed by children 5-19 years of age (29.5 per 1,000 consultations) in week 15.
Influenza-like illness (ILI) consultation rates, Canada, by report week, 2010-2011 compared to 1996/97 through to 2008/09 seasons

2011-w15-fg3-eng.gif

Note: No data available for mean rate in previous years for weeks 19 to 39 (1996-1997 through 2002-2003 seasons). Delays in the reporting of data may cause data to change retrospectively.
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Laboratory Surveillance Summary
The overall proportion of tests that were positive for influenza during week 15 was 10.3% (3.8% influenza A, 6.5% influenza B), which is stable compared to week 14 (10.4%) and the second week in which more influenza B detections were reported than influenza A. The proportion of positive tests peaked in week 52 (see Influenza tests graph). Of the 369 positive tests reported during week 15, 136 (36.9%) were influenza A and 233 (63.1%) were influenza B. Since the beginning of the season, 87.5% (16,262/18,595) of influenza virus detections have been influenza A viruses, of which 84.7% (5,425/6,405) of subtyped specimens have been A/H3N2. Detections of influenza B have been increasing steadily since week 03, when it accounted for 3.4% of all positive influenza specimens to 63.1% in week 15. Among influenza A detections in week 15, 60 (44.1%) specimens were reported as influenza A/H3N2, 13 (9.6%) as pandemic H1N1 2009, and 63 (46.3%) as unsubtyped influenza A. Through detailed case-based laboratory reporting where age data is provided, since August 29, 2010, 50.8% (2043/4018) of cases with A/H3N2 were aged 65 years or older. In contrast, the majority (94.5%, 741/784) of cases with pandemic H1N1 2009 were under 65 years of age (see Tests detailed table). In week 15, the proportion of positive tests for respiratory syncytial virus detections (RSV) decreased to 11.0% of specimens tested. The proportion of positive RSV tests appears to have peaked in week 07 (see Respiratory viruses graph).
Weekly & Cumulative numbers of positive influenza specimens by Provincial Laboratories, Canada, 2010-2011

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=13>* Unsubtyped: The specimen was typed as influenza A, but no test for subtyping was performed. Specimens from NT, YT, and NU are sent to reference laboratories in other provinces. Note: Cumulative data includes updates to previous weeks; due to reporting delays, the sum of weekly report totals do not add up to cumulative totals.
</TD></TR></TFOOT><TBODY><TR class=alignCenter><TH class=bg-colour-blue rowSpan=3 scope=col>Reporting provinces</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Weekly (April 10 to April 16, 2011)</TH><TH class="bg-colour-blue fontSize85" colSpan=6 scope=colgroup>Cumulative (August 29, 2010 to April 16, 2011)</TH></TR><TR class=alignCenter><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class="bg-colour-blue fontSize85" scope=col>B</TH><TH class="bg-colour-blue fontSize85" colSpan=5 scope=colgroup>Influenza A</TH><TH class=bg-colour-blue scope=col>B</TH></TR><TR class=alignCenter><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A Total</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H1)</TH><TH class="fontSize85 bg-colour-blue" scope=col>A(H3)</TH><TH class="fontSize85 bg-colour-blue" scope=col>Pand H1N1</TH><TH class="fontSize85 bg-colour-blue noWrap" scope=col>A (Un S)*</TH><TH class="fontSize85 bg-colour-blue" scope=col>Total</TH></TR><TR><TH class=bg-colour-blue scope=row>BC</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>472</TD><TD class=alignCenter>0</TD><TD class=alignCenter>196</TD><TD class=alignCenter>163</TD><TD class=alignCenter>113</TD><TD class=alignCenter>175</TD></TR><TR><TH class=bg-colour-blue scope=row>AB</TH><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>7</TD><TD class=alignCenter>2</TD><TD class=alignCenter>47</TD><TD class=alignCenter>1032</TD><TD class=alignCenter>0</TD><TD class=alignCenter>726</TD><TD class=alignCenter>269</TD><TD class=alignCenter>37</TD><TD class=alignCenter>662</TD></TR><TR><TH class=bg-colour-blue scope=row>SK</TH><TD class=alignCenter>14</TD><TD class=alignCenter>0</TD><TD class=alignCenter>10</TD><TD class=alignCenter>0</TD><TD class=alignCenter>4</TD><TD class=alignCenter>26</TD><TD class=alignCenter>311</TD><TD class=alignCenter>0</TD><TD class=alignCenter>209</TD><TD class=alignCenter>30</TD><TD class=alignCenter>72</TD><TD class=alignCenter>124</TD></TR><TR><TH class=bg-colour-blue scope=row>MB</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>3</TD><TD class=alignCenter>515</TD><TD class=alignCenter>0</TD><TD class=alignCenter>56</TD><TD class=alignCenter>2</TD><TD class=alignCenter>457</TD><TD class=alignCenter>9</TD></TR><TR><TH class=bg-colour-blue scope=row>ON</TH><TD class=alignCenter>21</TD><TD class=alignCenter>0</TD><TD class=alignCenter>6</TD><TD class=alignCenter>5</TD><TD class=alignCenter>10</TD><TD class=alignCenter>61</TD><TD class=alignCenter>6866</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2433</TD><TD class=alignCenter>269</TD><TD class=alignCenter>4164</TD><TD class=alignCenter>740</TD></TR><TR><TH class=bg-colour-blue scope=row>QC</TH><TD class=alignCenter>33</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>1</TD><TD class=alignCenter>31</TD><TD class=alignCenter>83</TD><TD class=alignCenter>5600</TD><TD class=alignCenter>0</TD><TD class=alignCenter>877</TD><TD class=alignCenter>38</TD><TD class=alignCenter>4685</TD><TD class=alignCenter>544</TD></TR><TR><TH class=bg-colour-blue scope=row>NB</TH><TD class=alignCenter>20</TD><TD class=alignCenter>0</TD><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>9</TD><TD class=alignCenter>937</TD><TD class=alignCenter>0</TD><TD class=alignCenter>657</TD><TD class=alignCenter>176</TD><TD class=alignCenter>104</TD><TD class=alignCenter>62</TD></TR><TR><TH class=bg-colour-blue scope=row>NS</TH><TD class=alignCenter>15</TD><TD class=alignCenter>0</TD><TD class=alignCenter>8</TD><TD class=alignCenter>0</TD><TD class=alignCenter>7</TD><TD class=alignCenter>0</TD><TD class=alignCenter>252</TD><TD class=alignCenter>0</TD><TD class=alignCenter>78</TD><TD class=alignCenter>11</TD><TD class=alignCenter>163</TD><TD class=alignCenter>3</TD></TR><TR><TH class=bg-colour-blue scope=row>PE</TH><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>97</TD><TD class=alignCenter>0</TD><TD class=alignCenter>79</TD><TD class=alignCenter>16</TD><TD class=alignCenter>2</TD><TD class=alignCenter>6</TD></TR><TR><TH class=bg-colour-blue scope=row>NL</TH><TD class=alignCenter>13</TD><TD class=alignCenter>0</TD><TD class=alignCenter>11</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>3</TD><TD class=alignCenter>180</TD><TD class=alignCenter>0</TD><TD class=alignCenter>114</TD><TD class=alignCenter>6</TD><TD class=alignCenter>60</TD><TD class=alignCenter>8</TD></TR><TR><TH class=bg-colour-blue scope=row>Canada</TH><TD class=alignCenter>136</TD><TD class=alignCenter>0</TD><TD class=alignCenter>60</TD><TD class=alignCenter>13</TD><TD class=alignCenter>63</TD><TD class=alignCenter>233</TD><TD class=alignCenter>16262</TD><TD class=alignCenter>0</TD><TD class=alignCenter>5425</TD><TD class=alignCenter>980</TD><TD class=alignCenter>9857</TD><TD class=alignCenter>2333</TD></TR></TBODY></TABLE>

Weekly & Cumulative numbers of positive influenza specimens by age groups reported through case-based laboratory reporting, Canada, 2010-2011*

<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><TFOOT><TR><TD class=fontSize85 colSpan=11> * Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK, MB and ON). Delays in the reporting of data may cause data to change retrospectively.
</TD></TR></TFOOT><TBODY><TR class=bg-colour-yellow><TH rowSpan=3 scope=col>Age groups</TH><TH colSpan=5 scope=colgroup>Weekly
(April 10 to April 16, 2011)</TH><TH colSpan=5 scope=colgroup>Cumulative
(Aug. 29, 2010 to Apr. 16, 2011)
</TH></TR><TR class=bg-colour-yellow><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH><TH colSpan=4 scope=colgroup>Influenza A</TH><TH>B</TH></TR><TR class=bg-colour-yellow><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH><TH scope=col>A Total</TH><TH scope=col>Pandemic H1N1</TH><TH scope=col>A/H3N2</TH><TH scope=col>A unsubtyped</TH><TH scope=col>Total</TH></TR><TR><TD><5</TD><TD class=alignCenter>5</TD><TD class=alignCenter>2</TD><TD class=alignCenter>3</TD><TD class=alignCenter>0</TD><TD class=alignCenter>14</TD><TD class=alignCenter>994</TD><TD class=alignCenter>125</TD><TD class=alignCenter>726</TD><TD class=alignCenter>143</TD><TD class=alignCenter>338</TD></TR><TR><TD>5-19</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>1</TD><TD class=alignCenter>0</TD><TD class=alignCenter>13</TD><TD class=alignCenter>515</TD><TD class=alignCenter>103</TD><TD class=alignCenter>295</TD><TD class=alignCenter>117</TD><TD class=alignCenter>476</TD></TR><TR><TD>20-44</TD><TD class=alignCenter>4</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD><TD class=alignCenter>2</TD><TD class=alignCenter>8</TD><TD class=alignCenter>1068</TD><TD class=alignCenter>328</TD><TD class=alignCenter>524</TD><TD class=alignCenter>216</TD><TD class=alignCenter>256</TD></TR><TR><TD>45-64</TD><TD class=alignCenter>4</TD><TD class=alignCenter>1</TD><TD class=alignCenter>2</TD><TD class=alignCenter>1</TD><TD class=alignCenter>8</TD><TD class=alignCenter>782</TD><TD class=alignCenter>185</TD><TD class=alignCenter>430</TD><TD class=alignCenter>167</TD><TD class=alignCenter>108</TD></TR><TR><TD>65+</TD><TD class=alignCenter>25</TD><TD class=alignCenter>0</TD><TD class=alignCenter>12</TD><TD class=alignCenter>13</TD><TD class=alignCenter>11</TD><TD class=alignCenter>2476</TD><TD class=alignCenter>43</TD><TD class=alignCenter>2043</TD><TD class=alignCenter>390</TD><TD class=alignCenter>132</TD></TR><TR><TD>Unknown</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>0</TD><TD class=alignCenter>229</TD><TD class=alignCenter>3</TD><TD class=alignCenter>224</TD><TD class=alignCenter>2</TD><TD class=alignCenter>0</TD></TR><TR><TD>Total</TD><TD class=alignCenter>39</TD><TD class=alignCenter>5</TD><TD class=alignCenter>18</TD><TD class=alignCenter>16</TD><TD class=alignCenter>54</TD><TD class=alignCenter>6064</TD><TD class=alignCenter>787</TD><TD class=alignCenter>4242</TD><TD class=alignCenter>1035</TD><TD class=alignCenter>1310</TD></TR></TBODY></TABLE>


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Influenza tests reported and percentage of tests positive, Canada, by report week, 2010-2011

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Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2010-2011

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Canadian situation

Antigenic Characterization
Between September 1 and April 20, 2011, the National Microbiology Laboratory (NML) has antigenically characterized 726 influenza viruses that were received from provincial laboratories: 248 A/H3N2, 127 pandemic H1N1 2009 and 351 B viruses. Of the 248 influenza A/H3N2 viruses characterized, 245 (98.8%) were antigenically related to A/Perth/16/2009, which is the influenza A/H3N2 component recommended for the 2010-11 influenza vaccine. Three viruses (1.2%) tested showed reduced titer with antiserum produced against A/Perth/16/2009. Of the 127 pandemic H1N1 2009 viruses characterized, 126 (99%) were antigenically related to the pandemic vaccine virus A/California/7/2009, which is the recommended H1N1 component for the 2010-11 influenza vaccine. One virus (1%) tested showed reduced titer with antiserum produced against A/California/7/2009. Of the 351 influenza B viruses characterized, 336 (95.7%) were antigenically related to B/Brisbane/60/08 (Victoria lineage), which is the recommended influenza B component for the 2010-11 influenza vaccine. Four of the 336 viruses tested showed reduced titer with antisera produced against B/Brisbane/60/08. Fifteen (5.1%) influenza B viruses were characterized as B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. B/Wisconsin/01/2010-like viruses are antigenically and genetically different from the previous Yamagata lineage vaccine strain B/Florida/04/2006.
Antiviral Resistance
Since the beginning of the 2010-2011 season, NML has tested 513 influenza A isolates (400 A/H3N2 and 113 pandemic H1N1 2009) for amantadine resistance and found that 399 influenza A/H3N2 were resistant to amantadine and one was sensitive. All 113 influenza A/H1N1 viruses were resistant to amantadine. Of 575 influenza viruses (208 A/H3N2, 103 pandemic H1N1 2009, and 264 influenza B) tested for resistance to oseltamivir, 207 A/H3N2 viruses were sensitive to oseltamivir and one was resistant to oseltamivir with E119V mutation. The resistant case was associated with oseltamivir prophylaxis/treatment. Of the 103 pandemic H1N1 2009 isolates tested, 102 were sensitive to oseltamivir and one was resistant to oseltamivir with the H275Y mutation. The resistant case was associated with oseltamivir treatment. All 264 B viruses were sensitive to oseltamivir. Of 565 influenza viruses (203 A/H3N2, 100 pandemic H1N1 2009, and 262 influenza B) tested for resistance to zanamivir, all isolates were found to be sensitive to zanamivir.
Severe Illness Surveillance

Paediatric Influenza Hospitalizations and Deaths
In week 15, 5 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (IMPACT) network: 4 from QC, and 1 from NL. This number has decreased compared to the previous week (week 14) in which 27 paediatric hospitalizations were reported (note that numbers may fluctuate because of the delays in reporting). Five paediatric deaths have been reported via IMPACT this season all with underlying comorbidities.
Since the beginning of the season, 624 hospitalizations with laboratory-confirmed influenza have been reported from all participating provinces; 101 (16.2%) as influenza A/H3N2, 22 (3.5%) pandemic H1N1 2009, 328 (52.6%) as unsubytped influenza A, and 173 (27.7%) influenza B. The distribution of cases to date by age group was as follows: 17.0% among 0-5 month olds; 28.4% among 6-23 month olds; 28.8% among the 2-4 year-olds; 14.9% among 5-9 year-olds; and 10.9% among children 10-16 years old.

Adult Influenza Hospitalizations and Deaths
During week 15, 5 new hospitalizations with laboratory-confirmed influenza among adults (16 years of age and older) were reported through the Canadian Nosocomial Infection Surveillance Program (CNISP). This number has decreased compared to the 7 cases reported in week 14 (note that numbers may fluctuate because of the delays in reporting). Of the 5 new cases reported between April 10 and 16, 2011, 3 (60.0%) tested positive for unsubtyped influenza A, and 2 (40.0%) as influenza B. Since the beginning of the season, 948 hospitalized cases have been reported: 201 (21.2%) A/H3N2, 45 (4.7%) pandemic H1N1 2009, 640 (67.5%) influenza A unsubtyped, and 62 (6.5%) influenza B, from all reporting provinces. To date, 641 of the 948 (67.6%) cases were aged 65 years or older and 430 (45.4%) were males.

Aggregate Influenza Hospitalizations and Deaths
Nine provinces and territories (excluding BC, QC, NB and NU) currently conduct severe outcomes surveillance and report weekly numbers of hospitalizations, ICU admissions and deaths with laboratory-confirmed influenza. In week 15, one death with influenza was reported in Ontario, in a person >65 years old with unsubtyped influenza A. Among the 218 fatal cases reported since the beginning of the influenza season, influenza A/H3N2 was identified in 61.5% (134/218), unsubtyped influenza A in 28.0% (61/218), pandemic H1N1 2009 in 6.0% (13/218), and influenza B in 4.6% (10/218). Seventy-nine percent (173/218) of these fatal cases were among persons 65 years of age or older, and another 11% (24/218) were between the ages of 45 and 64 years old, in keeping with the age-groups usually affected by A/H3N2. (Note that numbers may fluctuate because of the delays in reporting).

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http://origin.phac-aspc.gc.ca/fluwatch/10-11/w15_11/index-eng.php
 
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