Fluwatch Report: November 4 to November 10, 2012 (Week 45)
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<A title="Flu Watch (Version PDF, 113 KB - 6 pages)" href="http://www.phac-aspc.gc.ca/fluwatch/12-13/w45_12/pdf/fw2012-45-eng.pdf">2012-2013 FluWatch report: November 4 to November 10, 2012 (Week 45) (<ABBR title="Portable Document Format">PDF</ABBR> Version - 113 <ABBR title=Kilobytes>KB</ABBR> - 6 pages)
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Overall Influenza Summary
- Influenza activity in Canada increased compared to the previous week with more regions reporting increased activity, particularly in Ontario; however overall activity in Canada still remains relatively low, with the majority of regions of the country reporting no activity.
- In week 45, a total of 106 laboratory detections of influenza were reported, of which 92.5% were for influenza A viruses, predominantly A(H3N2).
- Eight influenza outbreaks were reported in week 45: 5 in long-term care facilities and 3 in other settings.
- One influenza-associated hospitalization was reported through the IMPACT network, with influenza A from BC, and 16 influenza-associated hospitalizations in adults ≥20 years of age were reported through Aggregate surveillance.
- The ILI consultation rate decreased slightly in week 45 but is within the expected level for this time of year.
In week 45, 1 region [in ON] reported widespread activity, 3 regions [in AB(1), and ON(2)] reported localized activity, 13 regions [in BC(2), AB(2), MB(1), ON(3), QC(4) and NB(1)] reported sporadic activity and the rest reported no activity (Figures 1 and 2). Eight new influenza outbreaks were reported in week 45: 5 in long-term care facilities [in AB(3) and ON(2)] and 3 in other settings [in ON ] (Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 45
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 for figure 1Map of overall Influenza activity level by province and territory, Canada
Figure 2. 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, 2012-2013 (N<SUP>*</SUP>=58)
?sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
* Total number of influenza surveillance regions in Canada
Text equivalent for figure 2Number of influenza surveillance regions reporting widespread or localized influenza activity, Canada, by report week, 2011-2012 (N=56)
Figure 3. Overall Number of Influenza Outbreaks, Canada, by Report Week, 2012-2013
Text equivalent for figure 3Overall Number of Influenza Outbreaks, Canada, by Report Week, 2011-2012
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Influenza and Other Respiratory Virus Detections
The percentage of positive influenza tests increased from the previous week, from 2.8% in week 44 to 5.0% in week 45 (Figure 4 and link to figure 55). Among the influenza viruses detected this week (n=106), 92.5% were positive for influenza A viruses [of which 61.2% were A(H3), 6.1% were A(H1N1)pdm09, and 32.7% were A unsubtyped] and 7.5% for influenza B viruses (Table 1).
Cumulative influenza virus detections by type/subtype to date are as follows: 91.9% influenza A [65.7% A(H3), 5.6% A(H1N1)pdm09 and 28.7% A(unsubtyped)] and 8.1% influenza B (Table 1).
Detailed information on age and type/subtype was received for 168 cases to date this season (Table 2). The proportions of cases by age group were as follows: 13.7% were < 5 years; 8.3% were between 5-19 years; 14.3% were between 20-44 years; 15.5% were between 45-64 years of age; 48.2% were ≥ 65 years.
The percentage positive for rhinovirus detections increased slightly from the previous week, from 17.1% in week 44 to 19.1% week 45; and remains the highest compared to the other respiratory viruses. The percentage positive for the other respiratory viruses in week 45 remained low, although several increased slightly compared to week 44: RSV 4.1%; parainfluenza 3.9%; adenovirus 2.3%; hMPV 0.2%; and coronavirus 2.3% (Figure 5). For more details, see the weekly Respiratory Virus Detections in Canada Report.
<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><CAPTION class=alignCenter>Table 1: Weekly & Cumulative numbers of positive influenza specimens
by Provincial Laboratories, Canada, 2012-2013
</CAPTION><THEAD><TR class=bg-colour-yellow><TH id=ar1 rowSpan=3>Reporting provinces</TH><TH id=ac1 colSpan=6>Weekly
(November 4 to November 10, 2012)
</TH><TH id=ac9 colSpan=6>Cumulative
(August 26, 2012 to November 10, 2012)
</TH></TR><TR class=bg-colour-yellow><TH id=ac2 colSpan=5 headers=ac1>Influenza A</TH><TH id=ac8 headers=ac1>Influenza
B
</TH><TH id=ac10 colSpan=5 headers=ac9>Influenza A</TH><TH id=ac16 headers=ac9>Influenza
B
</TH></TR><TR class=bg-colour-yellow><TH id=ac3 headers=ac2>A Total</TH><TH id=ac4 headers=ac2>A(H1)</TH><TH id=ac5 headers=ac2>A(H3)</TH><TH id=ac6 headers=ac2>Pand H1N1</TH><TH id=ac7 class=noWrap headers=ac2>A
( <ABBR title=unsubtyped>Un S</ABBR>)Table 1 note*
</TH><TH headers="ac1 ac8">Total</TH><TH id=ac11 headers=ac10>A Total</TH><TH id=ac12 headers=ac10>A(H1)</TH><TH id=ac13 headers=ac10>A(H3)</TH><TH id=ac14 headers=ac10>Pand H1N1</TH><TH id=ac15 class=noWrap headers=ac10>A
(Un S) Table 1 note*
</TH><TH headers=ac16>Total</TH></TR></THEAD><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: Weekly data is based on week of positive lab detection. 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><TH id=ar2 class=bg-colour-yellow headers=ar1><ABBR title="British Columbia ">BC</ABBR></TH><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac3">3</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">3</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac11">10</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">7</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">3</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">4</TD></TR><TR><TH id=ar3 class=bg-colour-yellow headers=ar1><ABBR title=Alberta>AB</ABBR></TH><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac3">38</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">31</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">6</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">99</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">80</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">8</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">11</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">3</TD></TR><TR><TH id=ar4 class=bg-colour-yellow headers=ar1><ABBR title=Saskatchewan>SK</ABBR></TH><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac3">1</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">1</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">4</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">1</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">3</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">1</TD></TR><TR><TH id=ar5 class=bg-colour-yellow headers=ar1><ABBR title=Manitoba>MB</ABBR></TH><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac3">3</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac5">3</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">7</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">6</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">1</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">1</TD></TR><TR><TH id=ar6 class=bg-colour-yellow headers=ar1><ABBR title=Ontario>ON</ABBR></TH><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac3">28</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">22</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">4</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">2</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">3</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">87</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">63</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">5</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">19</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">6</TD></TR><TR><TH id=ar7 class=bg-colour-yellow headers=ar1><ABBR title=Quebec>QC</ABBR>
</TH><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac3">24</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">24</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">2</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">41</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac13">6</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">35</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">7</TD></TR><TR><TH id=ar8 class=bg-colour-yellow headers=ar1><ABBR title="New Brunswick">NB</ABBR>
</TH><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac3">1</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac5">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">0</TD></TR><TR><TH id=ar9 class=bg-colour-yellow headers=ar1><ABBR title="Nova Scotia ">NS</ABBR>
</TH><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac3">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac5">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac11">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac13">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac16">0</TD></TR><TR><TH id=ar10 class=bg-colour-yellow headers=ar1><ABBR title="Prince Edward Island ">PE</ABBR>
</TH><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac3">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac5">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac11">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac13">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac16">0</TD></TR><TR><TH id=ar11 class=bg-colour-yellow headers=ar1><ABBR title="Newfoundland/Labrador ">NL</ABBR>
</TH><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac3">0</TD><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac5">0</TD><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac11">2</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac13">2</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">0</TD></TR><TR><TH id=ar12 class=bg-colour-yellow headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">98</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">60</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">6</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">32</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">8</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">251</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">165</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">14</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">72</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">22</TD></TR></TBODY></TABLE>
<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><CAPTION>Table 2. Weekly & Cumulative numbers of positive influenza specimens by age groups
reported through case-based laboratory reporting, Canada, 2012-2013 Table 2 note*
</CAPTION><THEAD><TR class=bg-colour-yellow><TH id=br1 rowSpan=3>Age groups</TH><TH id=bc1 colSpan=5>Weekly
(November 4 to November 10, 2012)
</TH><TH id=bc8 colSpan=5>Cumulative
(August 26, 2012 to November 10, 2012)
</TH></TR><TR class=bg-colour-yellow><TH id=bc2 colSpan=4 headers=bc1>Influenza A</TH><TH id=bc7 headers=bc1>B</TH><TH id=bc9 colSpan=4 headers=bc8>Influenza A</TH><TH id=bc14 headers=bc8>B</TH></TR><TR class=bg-colour-yellow><TH id=bc3 headers=bc2>A Total</TH><TH id=bc4 headers=bc2>Pandemic H1N1</TH><TH id=bc5 headers=bc2>A/H3N2</TH><TH id=bc6 headers=bc2>A unsubtyped</TH><TH headers="bc1 bc7">Total</TH><TH id=bc10 headers=bc9>A Total</TH><TH id=bc11 headers=bc9>Pandemic H1N1</TH><TH id=bc12 headers=bc9>A/H3N2</TH><TH id=bc13 headers=bc9>A unsubtyped</TH><TH headers=bc14>Total</TH></TR></THEAD><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. Delays in the reporting of data may cause data to change retrospectively. </TD></TR></TFOOT><TBODY><TR><TH id=br2 headers=br1>< 5</TH><TD class=alignRight headers="br1 br2 bc1 bc2 bc3">4</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">2</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br2 bc1 bc7">0</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">19</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">2</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">14</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">3</TD><TD class=alignRight headers="br1 br2 bc8 bc14">4</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">0</TD><TD class=alignRight headers="br1 br3 bc1 bc7">1</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">13</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">0</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">9</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">4</TD><TD class=alignRight headers="br1 br3 bc8 bc14">1</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">4</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">2</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br4 bc1 bc7">0</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">23</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">5</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">12</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">6</TD><TD class=alignRight headers="br1 br4 bc8 bc14">1</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">1</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">1</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">0</TD><TD class=alignRight headers="br1 br5 bc1 bc7">0</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">22</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">1</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">16</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">5</TD><TD class=alignRight headers="br1 br5 bc8 bc14">4</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">8</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">8</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">0</TD><TD class=alignRight headers="br1 br6 bc1 bc7">0</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">78</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">2</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">59</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">17</TD><TD class=alignRight headers="br1 br6 bc8 bc14">3</TD></TR><TR><TH id=br7 headers=br1>Unknown</TH><TD class=alignRight headers="br1 br7 bc1 bc2 bc3">0</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc5">0</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc6">0</TD><TD class=alignRight headers="br1 br7 bc1 bc7">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc10">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc13">0</TD><TD class=alignRight headers="br1 br7 bc8 bc14">0</TD></TR><TR><TH id=br8 headers=br1>Total</TH><TD class=alignRight headers="br1 br8 bc1 bc2 bc3">18</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">14</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">2</TD><TD class=alignRight headers="br1 br8 bc1 bc7">1</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">155</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">10</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">110</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">35</TD><TD class=alignRight headers="br1 br8 bc8 bc14">13</TD></TR></TBODY></TABLE>
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Figure 4. Influenza tests reported and percentage of tests positive, Canada,
by report week, 2012-2013
Text equivalent for figure 4Influenza tests reported and percentage of tests positive, Canada, by report week, 2011-2012
Figure 5. Percent positive influenza tests, compared to other respiratory viruses,
Canada, by reporting week, 2012-2013
Text equivalent for figure 5Percent positive influenza tests, compared to other respiratory viruses, Canada, by reporting week, 2011-2012
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Influenza strain characterizations
Since the start of the season, the National Microbiology Laboratory (NML) has antigenically characterized 9 influenza viruses [7 A(H3N2) and 2 B]. The 7 influenza A(H3N2) viruses (from BC, ON and QC) were antigenically similar to the vaccine strain A/Victoria/361/2011. Both of the influenza B viruses (from ON and QC) were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) (Figure 6).
Figure 6. Influenza strain characterizations, Canada, 2012-2013, N = 9
Note:The recommended components for the 2012-2013 Northern Hemisphere influenza vaccine include: an A/Victoria/361/2011 (H3N2)-like virus; an A/California/7/2009 (H1N1)pdm09-like virus; and a B/Wisconsin/1/2010-like virus.
Text equivalent for figure 6Influenza strain characterizations, Canada, 2011-2012
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Antiviral resistance
Since the beginning of the season, NML has tested 9 influenza viruses [7 A(H3N2) and 2 B] for resistance to oseltamivir and zanamivir and it was found that all were sensitive to oseltamivir and zanamivir. A total of 21 influenza A(H3N2) viruses were tested for amantadine resistance and all were resistant (Table 3).
<TABLE class=widthFull border=1 cellSpacing=0 cellPadding=2><CAPTION>Table 3. Antiviral resistance by influenza virus type and subtype, Canada, 2012-2013</CAPTION><THEAD><TR class=bg-colour-yellow><TH id=cr1 rowSpan=2>Virus type and subtype</TH><TH id=cc1 colSpan=2>Oseltamivir</TH><TH id=cc4 colSpan=2>Zanamivir</TH><TH id=cc7 colSpan=2>Amantadine</TH></TR><TR class=bg-colour-yellow><TH id=cc2 headers=cc1># tested</TH><TH id=cc3 headers=cc1># resistant (%)</TH><TH id=cc5 headers=cc4># tested</TH><TH id=cc6 headers=cc4># resistant (%)</TH><TH id=cc8 headers=cc7># tested</TH><TH id=cc9 headers=cc7># resistant (%)</TH></TR></THEAD><TFOOT><TR><TD class=fontSize85 colSpan=7><SUP>*</SUP> NA - not applicable</TD></TR></TFOOT><TBODY><TR><TH id=cr2 class="alignLeft bg-colour-blue" headers=cr1>A (H3N2)</TH><TD class=alignCenter headers="cr2 cc2">7</TD><TD class=alignCenter headers="cr2 cc3">0</TD><TD class=alignCenter headers="cr2 cc5">7</TD><TD class=alignCenter headers="cr2 cc6">0</TD><TD class=alignCenter headers="cr2 cc8">21</TD><TD class=alignCenter headers="cr2 cc9">21 (100%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignCenter headers="cr3 cc2">0</TD><TD class=alignCenter headers="cr3 cc3">0</TD><TD class=alignCenter headers="cr3 cc5">0</TD><TD class=alignCenter headers="cr3 cc6">0</TD><TD class=alignCenter headers="cr3 cc8">0</TD><TD class=alignCenter headers="cr3 cc9">0</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignCenter headers="cr4 cc2">2</TD><TD class=alignCenter headers="cr4 cc3">0</TD><TD class=alignCenter headers="cr4 cc5">2</TD><TD class=alignCenter headers="cr4 cc6">0</TD><TD class=alignCenter headers="cr4 cc8">NA <SUP>*</SUP></TD><TD class=alignCenter headers="cr4 cc9">NA <SUP>*</SUP></TD></TR><TR><TH id=cr5 class="alignLeft bg-colour-blue" headers=cr1>TOTAL</TH><TD class=alignCenter headers="cr5 cc2">9</TD><TD class=alignCenter headers="cr5 cc3">0</TD><TD class=alignCenter headers="cr5 cc5">9</TD><TD class=alignCenter headers="cr5 cc6">0</TD><TD class=alignCenter headers="cr5 cc8">21</TD><TD class=alignCenter headers="cr5 cc9">21 (100%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national influenza-like-illness (ILI) consultation rate in week 45 decreased from the previous week from 22.2 to 19.1 ILI consultations per 1,000 patient visits; but remains within the expected levels for this time of year (Figure 7). The highest consultation rates were observed in children 5-19 years of age (31.3/1,000) and adults 20-64 years of age (17.6/1,000).
Figure 7. Influenza-like illness (ILI) consultation rates, Canada, by report week, 2012-2013 compared to 1996/97 through to 2011/12 seasons (with pandemic data suppressed)
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 for figure 7Influenza-like illness (ILI) consultation rates, Canada, by report week, 2011-2012 compared to 1996/97 through to 2010/11 seasons (with pandemic data suppressed)
Severe Respiratory Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths (IMPACT)
In week 45, one new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalization was reported by the Immunization Monitoring Program Active (IMPACT) network. The case was reported in BC, in a child 10-16 years of age with unsubtyped influenza A.
Since the start of the 2012-13 season, a total of three laboratory-confirmed influenza-associated paediatric hospitalizations have been reported by the IMPACT network. Two cases were between 10-16 years of age, and one between 5-9 years of age. In all three cases, influenza A was detected [two A(H3N2), one influenza A(unsubtyped)]. One case is reported to have had underlying conditions, and this case was admitted to the ICU.
Note: The number of hospitalizations reported through IMPACT represents a subset of all influenza-associate paediatric hospitalizations in Canada.
Influenza Hospitalizations and Deaths (Aggregate Surveillance System<SUP>*</SUP>)
In week 45, 20 laboratory-confirmed influenza A-associated hospitalizations were reported [ON(9), AB(11)]. Of these, 4 were aged between 1-4 years, 1 between 20-44 years, 2 between 45-64 years, and 13 were aged ≥65 years. Of these hospitalizations, 15 were due to Influenza A(H3N2) and five were due to influenza A (unsubtyped). No deaths were reported this week. Of the 11 cases with available data, none were admitted to the Intensive Care Unit (ICU).
To date this season, 49 influenza A-associated hospitalizations have been reported from four provinces (AB, MB, ON & NL). The majority of the cases (75.5%; 37/49) were ≥ 65 years of age. Of the influenza A hospitalizations for which subtype was available (n=40), 7.5% (3/40) were due to influenza A(H1N1)pdm09 and 92.5% (37/40) were due to A(H3). Of the 29 cases with available data, there have been four hospitalizations for which admission to ICU was required (from NL and AB). To date this season, one influenza A(H3)-associated death has been reported (week 36) in a hospitalized case who was ≥ 65 years of age.
* Note: The number of influenza-associated hospitalizations reported by the Aggregate Surveillance System may include cases reported by the IMPACT network. Influenza-associated hospitalizations are not reported to PHAC by the following Provinces and Territory: BC, NU, QC, NS, and NB. Only hospitalizations that require intensive medical care are reported by SK. ICU admissions are not reported in ON.
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