Re: Canada FluWatch Weekly Reports 2012-2013 Season Week 2
2012-2013 FluWatch report: January 6 to January 12, 2013 (Week 2)
Posted 2013-01-18For readers interested in the <ABBR title="Portable Document Format">PDF</ABBR> version, the document is available for downloading or viewing:
<A title="Flu Watch (Version PDF, 113 KB - 6 pages)" href="http://www.phac-aspc.gc.ca/fluwatch/12-13/w02_13/pdf/fw2013-02-eng.pdf">2012-2013 FluWatch report: January 6 to January 12, 2013 (Week 2) (<ABBR title="Portable Document Format">PDF</ABBR> Version - 113 <ABBR title=Kilobytes>KB</ABBR> - 6 pages)
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Overall Influenza Summary
In week 02, 15 regions [in BC(2), AB(2), ON(5), QC(3) and NL(3)] reported widespread activity and 25 regions [in BC(2), AB(3), SK(2), MB(4), ON(2), QC(2), NB(5), NS(3), NL(1) and NU(1)] reported localized activity (Figures 1 and 2). In week 02, 130 new influenza outbreaks were reported: 98 in long-term-care facilities, 2 in hospitals, 5 in schools, and 25 in other facilities or communities (Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 02
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 decreased from 32.5% in week 01 to 30.7% in week 02 (Figure 4).Among the influenza viruses detected in week 02 (n=3744), 97.8% were positive for influenza A viruses [of which 34.6% were A(H3), 1.9% were A(H1N1)pdm09, and 63.6% were A(unsubtyped)]; and 2.2% were positive for influenza B (Table 1). Cumulative influenza virus detections by type/subtype to date are as follows: 97.6% influenza A [34.3% A(H3), 1.4% A(H1N1)pdm09 and 64.3% A(unsubtyped)] and 2.4% influenza B (Table 1).
Detailed information on age and type/subtype was received for 13,556 cases to date this season (Table 2). The proportions of cases by age group were as follows: 12.5% were < 5 years; 7.1% were between 5-19 years; 15.1% were between 20-44 years; 16.2% were between 45-64 years of age; 49.1% were ≥ 65 years.
The percentage of tests positive for RSV was similar to week 01 (10.7%) at 10.4% in week 02. The percentage of tests positive for rhinovirus (3.9%), parainfluenza (2.3%), and coronavirus (3.6%) each increased slightly compared to the previous week. Other percentages of positive tests remained low in week 02: adenovirus 0.7%; hMPV 1.0% (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
(January 6 to January 12, 2013)
</TH><TH id=ac9 colSpan=6>Cumulative
(August 26, 2012 to January 12, 2013)
</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">217</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">146</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">6</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac7">65</TD><TD class=alignRight headers="ar1 ar2 ac1 ac8">17</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac11">608</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">519</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">12</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">77</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">37</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">297</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">197</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">36</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">64</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">15</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">1628</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">1378</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">112</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">138</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">101</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">121</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">78</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">43</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">9</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">533</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">366</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">4</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">163</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">34</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">109</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac5">19</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac7">89</TD><TD class=alignRight headers="ar1 ar5 ac1 ac8">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">233</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">61</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">1</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">171</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">19</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">1202</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">422</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">18</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">762</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">18</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">5053</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">2560</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">79</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">2414</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">89</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">1408</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">188</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">7</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">1213</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">19</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">7780</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac13">451</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac14">14</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">7315</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">119</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">212</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac5">212</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">341</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">271</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">10</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">60</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">2</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">22</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">22</TD><TD class=alignRight headers="ar1 ar9 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac11">35</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">35</TD><TD class=alignRight headers="ar1 ar9 ac9 ac16">2</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">3</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac5">3</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">25</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac13">24</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac14">1</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac16">1</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">70</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">70</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac11">241</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac13">16</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">225</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">1</TD></TR><TR><TH id=ar12 class=bg-colour-yellow headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">3661</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">1265</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">68</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">2328</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">83</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">16477</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">5646</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">233</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">10598</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">405</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
(January 6 to January 12, 2013)
</TH><TH id=bc8 colSpan=5>Cumulative
(August 26, 2012 to January 12, 2013)
</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">172</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">11</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">35</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">126</TD><TD class=alignRight headers="br1 br2 bc1 bc7">5</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">1631</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">44</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">546</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">1041</TD><TD class=alignRight headers="br1 br2 bc8 bc14">68</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">48</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">18</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">29</TD><TD class=alignRight headers="br1 br3 bc1 bc7">6</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">892</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">13</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">410</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">469</TD><TD class=alignRight headers="br1 br3 bc8 bc14">66</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">187</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">10</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">44</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">133</TD><TD class=alignRight headers="br1 br4 bc1 bc7">8</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">1995</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">59</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">776</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">1160</TD><TD class=alignRight headers="br1 br4 bc8 bc14">52</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">249</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">9</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">48</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">192</TD><TD class=alignRight headers="br1 br5 bc1 bc7">7</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">2143</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">54</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">747</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">1342</TD><TD class=alignRight headers="br1 br5 bc8 bc14">51</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">955</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">4</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">220</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">731</TD><TD class=alignRight headers="br1 br6 bc1 bc7">11</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">6584</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">30</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">2287</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">4267</TD><TD class=alignRight headers="br1 br6 bc8 bc14">74</TD></TR><TR><TH id=br7 headers=br1>Unknown</TH><TD class=alignRight headers="br1 br7 bc1 bc2 bc3">2</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc5">1</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br7 bc1 bc7">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc10">65</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">2</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">61</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc13">2</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">1613</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">35</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">366</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">1212</TD><TD class=alignRight headers="br1 br8 bc1 bc7">37</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">13310</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">202</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">4827</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">8281</TD><TD class=alignRight headers="br1 br8 bc8 bc14">311</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
During the 2012-13 season, the National Microbiology Laboratory (NML) has antigenically characterized 248 influenza viruses [172 A(H3N2), 36 A(H1N1)pdm09 , and 40 influenza B]. The 172 influenza A(H3N2) viruses were antigenically similar to the vaccine strain A/Victoria/361/2011 and the 36 A(H1N1)pdm09 viruses were antigenically similar to the vaccine strain A/California/07/09. Among the influenza B viruses, 31 were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) and 9 were similar to B/Brisbane/60/2008 (Victoria lineage; component of the 2011-2012 seasonal influenza vaccine) (Figure 6).
Figure 6. Influenza strain characterizations, Canada, 2012-2013, N = 248
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
During the 2012-13 season, NML has tested 214 influenza viruses for resistance to oseltamivir, and 213 influenza viruses for resistance to zanamivir. All viruses tested were sensitive to oseltamivir and zanamivir. A total of 333 influenza A 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">163</TD><TD class=alignCenter headers="cr2 cc3">0</TD><TD class=alignCenter headers="cr2 cc5">162</TD><TD class=alignCenter headers="cr2 cc6">0</TD><TD class=alignCenter headers="cr2 cc8">306</TD><TD class=alignCenter headers="cr2 cc9">306 (100%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignCenter headers="cr3 cc2">25</TD><TD class=alignCenter headers="cr3 cc3">0</TD><TD class=alignCenter headers="cr3 cc5">25</TD><TD class=alignCenter headers="cr3 cc6">0</TD><TD class=alignCenter headers="cr3 cc8">27</TD><TD class=alignCenter headers="cr3 cc9">27</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignCenter headers="cr4 cc2">26</TD><TD class=alignCenter headers="cr4 cc3">0</TD><TD class=alignCenter headers="cr4 cc5">26</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">214</TD><TD class=alignCenter headers="cr5 cc3">0</TD><TD class=alignCenter headers="cr5 cc5">213</TD><TD class=alignCenter headers="cr5 cc6">0</TD><TD class=alignCenter headers="cr5 cc8">333</TD><TD class=alignCenter headers="cr5 cc9">333 (100%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national influenza-like-illness (ILI) consultation rate increased from 58.7 ILI consultations per 1,000 patient visits in week 01 to 62.1 in week 02. This rate is well above the expected level for this time of year, which is between 24.0 and 42.5 ILI consultations per 1,000 visits (Figure 7). The increased ILI consultation rate may be due in part to ongoing influenza and RSV activity across Canada, as well as increased public attention to the early influenza season. In week 02, the highest consultation rates were observed in children <5 years of age (90.8/1,000) followed by children 5-19 years of age (78.2/1,000).
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)
Pharmacy Surveillance
The Canadian antiviral prescription rate decreased from 337.6 antiviral prescriptions per 100,000 new prescriptions dispensed in week 01 to 285.7 in week 02. In week 02, the antiviral prescription rate decreased for adult and senior age groups, and was stable for infants and children. The highest rate was observed among seniors ≥65 years, at 475.1/100,000. The current proportion of antiviral prescriptions of 285.7/100,000 is higher than the rate observed during the peak period of influenza activity last year (50-100/100,000); however, it continues to follow the trend of the percentage of positive laboratory tests for influenza.
Note: Pharmacy sales data are provided to the Public Health Agency of Canada by Rx Canada Inc. and sourced from major retail drug chains representing over 3,000 stores nationwide (excluding Nunavut) in 85% of Health Regions. Data provided include the number of new antiviral prescriptions (for Tamiflu and Relenza) and the total number of new prescriptions dispensed by Province/Territory and age group.
Severe Respiratory Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths (IMPACT)
In week 02, 51 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported by the Immunization Monitoring Program Active (IMPACT) network, compared to 74 in week 01. Among the 49 cases identified with influenza A, 42 (85.7%) were A(unsubtyped), 6 (12.2%) were A(H3N2) and 1 (2.0%) was A(H1N1)pdm09. Two cases were identified with influenza B. The age distribution is as follows: 10 cases (19.6%) under 6 months of age, 16 (31.4%) between 6-23 months, 16 (31.4%) aged 2-4 years, 8 (15.7%) aged 5-9 years, and 1 (2.0%) aged 10-16 years. Five ICU admissions were reported during this week, four cases between 6-23 months and one aged 2-4 years.
Since the start of the 2012-13 season, a total of 394 influenza-associated paediatric hospitalizations have been reported by the IMPACT network: 380 (96.4%) with influenza A [of which 56 (14.7%) were A(H3N2), 3 (0.8%) were A(H1N1)pdm09 and 321 (84.5%) were A(unsubtyped)], and 14 (3.6%) with influenza B. The distribution of cases by age group is as follows: 90 (22.8%) <6 months of age; 83 (21.1%) age 6-23 months; 112 (28.4%) age 2-4 years; 71 (18.0%) age 5-9 years; and 38 (9.6%) age 10-16 years. Thirty-six of the 394 cases (9.1%) were admitted to the ICU. No deaths have been reported to date.
Note: The number of hospitalizations reported through IMPACT represents a subset of all influenza-associate paediatric hospitalizations in Canada.
Adult Influenza Hospitalizations and Deaths (PCIRN)
In week 02, 44 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported by the PHAC/CIHR Influenza Research Network (PCIRN) Serious Outcomes Surveillance (SOS) network, compared to 26 in week 01. The age distribution is as follows: 34 cases (77.3%) were ≥65 years of age, 7 cases (15.9%) were aged 45-64 years, and 3 cases (6.8%) were aged 20-44 years. Among the 42 cases identified with influenza A, one was A(H3N2), and the rest were A(unsubtyped). Two cases were identified with influenza B. One ICU admission was reported during the current week in a case of influenza A(unsubtyped) in an individual ≥65 years of age. Three deaths were reported with influenza A(unsubtyped): two individuals were ≥65 years of age, and the third was 45-64 years of age.
From November 4, 2012 to January 12, 2013, a total of 276 influenza-associated adult hospitalizations were reported by the PCIRN-SOS network: 262 (94.9%) with influenza A [of which 30 (11.5%) were A(H3N2), 2 (0.8%) were A(H1N1), and 230 (87.8%) were A(unsubtyped)]; 6 (2.2%) with influenza B, and the type has not yet been reported for 8 (2.9%) cases. The distribution of cases by age group is as follows: 190 cases (68.8%) were aged ≥65 years, 60 cases (21.7%) were aged 45-64 years, 23 cases (8.3%) were aged 20-44 years, and 3 cases (1.1%) were <20 years of age. Thirteen of the 276 cases (4.7%) were admitted to the ICU. Six admissions were in adults aged ≥65 years, three were aged 45-64 years, and four were aged 20-44 years. Of the thirteen ICU admissions, eight cases (61.5%) had at least one comorbidity, one case (7.7%) had no co-morbidities, and four cases (30.8%) had no available information on comorbidities to date. Nine deaths have been reported to date, all in cases with influenza A(unsubtyped). Seven deaths were in adults aged ≥65 years, one was in a person aged 45-64 years, and one was in a person aged 20-44 years. Detailed clinical information on comorbidities is not known for these cases.
Note: The number of hospitalizations reported through PCIRN represents a subset of all influenza-associate adult hospitalizations in Canada.
Provincial/Territorial Influenza Hospitalizations and Deaths (Aggregate Surveillance System<SUP>*</SUP>)
In week 02, 823 laboratory-confirmed influenza-associated hospitalizations were reported*. Ninety eight percent of cases (810/823) were influenza A [42% A(H3); 2.3% A(H1N1)pdm09; 55.7% A(unsubtyped)], and 1.6% (13/823) were influenza B. More than half of the cases (60% 497/823) were ≥65 years of age, 16.5% were adults aged 46-64 years and 13% were children aged 0-4 years. Of the 130 cases with available data, 15.4% (20/130) were admitted to the Intensive Care Unit (ICU). Fifty-one deaths were reported in week 02, the majority of which were persons ≥65 years of age (78.4%; 40/51); 10 were adults aged 45-64 yeas and one was an adult aged 20-44 years. It is important to note that the cause of death does not have to be attributable to influenza, a positive laboratory test is sufficient for reporting. Detailed clinical information (e.g. underlying medical conditions) is not known for these cases.
To date this season, 1675 influenza-associated hospitalizations have been reported. Of these, 97.7% (1636/1675) have been influenza A [predominately A(H3) (45.7%; 748/1636)] and 2.3% have been influenza B. Half of the cases (55.7% 933/1675) were ≥65 years of age, 16.4% (275/1675) were adults aged 45-64 years and 14.4% (241/1675) were children aged 0-4 years. Among the 428 cases with available data, there have been 66 hospitalisations for which admission to ICU was required; 24 were persons ≥65 years of age, 24 were persons aged 45-64 years, 9 were adults aged 20-44 years, 1 was an individual aged 15-19 years, 3 were children aged 5-14 years and 5 were children aged 0-4 years. To date this season, 104 deaths have been reported: 86 were adults aged ≥ 65 years of age, 11 were adults aged 45-64 years; 4 were adults aged 20-44 years; and 3 were children aged 0-4 years. It is important to note that the cause of death does not have to be attributable to influenza, a positive laboratory test is sufficient for reporting. Detailed clinical information (e.g. underlying medical conditions) is not known for these cases.
* Note: The number of new influenza-associated hospitalizations and deaths reported by the Aggregate Surveillance System each week may be overestimated, as it may include retrospective updates to data from Ontario for previous weeks. These data may also include cases reported by the IMPACT and PCIRN networks. 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 Saskatchewan. ICU admissions are not reported in Ontario.
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2012-2013 FluWatch report: January 6 to January 12, 2013 (Week 2)
Posted 2013-01-18For readers interested in the <ABBR title="Portable Document Format">PDF</ABBR> version, the document is available for downloading or viewing:
<A title="Flu Watch (Version PDF, 113 KB - 6 pages)" href="http://www.phac-aspc.gc.ca/fluwatch/12-13/w02_13/pdf/fw2013-02-eng.pdf">2012-2013 FluWatch report: January 6 to January 12, 2013 (Week 2) (<ABBR title="Portable Document Format">PDF</ABBR> Version - 113 <ABBR title=Kilobytes>KB</ABBR> - 6 pages)
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Overall Influenza Summary
- The percentage of positive laboratory tests for influenza declined in week 02; however, more regions across Canada reported widespread and localized influenza activity and 130 new influenza outbreaks were reported.
- The ILI consultation rate increased and is well above the expected range for this time of year.
- A total of 3744 laboratory detections of influenza were reported, of which 97.8% were for influenza A viruses, predominantly A(H3N2).
- 51 new paediatric influenza-associated hospitalizations were reported through the IMPACT network.
- 44 new adult influenza-associated hospitalizations were reported through the PCIRN-SOS network.
In week 02, 15 regions [in BC(2), AB(2), ON(5), QC(3) and NL(3)] reported widespread activity and 25 regions [in BC(2), AB(3), SK(2), MB(4), ON(2), QC(2), NB(5), NS(3), NL(1) and NU(1)] reported localized activity (Figures 1 and 2). In week 02, 130 new influenza outbreaks were reported: 98 in long-term-care facilities, 2 in hospitals, 5 in schools, and 25 in other facilities or communities (Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 02
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 decreased from 32.5% in week 01 to 30.7% in week 02 (Figure 4).Among the influenza viruses detected in week 02 (n=3744), 97.8% were positive for influenza A viruses [of which 34.6% were A(H3), 1.9% were A(H1N1)pdm09, and 63.6% were A(unsubtyped)]; and 2.2% were positive for influenza B (Table 1). Cumulative influenza virus detections by type/subtype to date are as follows: 97.6% influenza A [34.3% A(H3), 1.4% A(H1N1)pdm09 and 64.3% A(unsubtyped)] and 2.4% influenza B (Table 1).
Detailed information on age and type/subtype was received for 13,556 cases to date this season (Table 2). The proportions of cases by age group were as follows: 12.5% were < 5 years; 7.1% were between 5-19 years; 15.1% were between 20-44 years; 16.2% were between 45-64 years of age; 49.1% were ≥ 65 years.
The percentage of tests positive for RSV was similar to week 01 (10.7%) at 10.4% in week 02. The percentage of tests positive for rhinovirus (3.9%), parainfluenza (2.3%), and coronavirus (3.6%) each increased slightly compared to the previous week. Other percentages of positive tests remained low in week 02: adenovirus 0.7%; hMPV 1.0% (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
(January 6 to January 12, 2013)
</TH><TH id=ac9 colSpan=6>Cumulative
(August 26, 2012 to January 12, 2013)
</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">217</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">146</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">6</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac7">65</TD><TD class=alignRight headers="ar1 ar2 ac1 ac8">17</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac11">608</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">519</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">12</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">77</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">37</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">297</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">197</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">36</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">64</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">15</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">1628</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">1378</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">112</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">138</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">101</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">121</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">78</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">43</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">9</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">533</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">366</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">4</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">163</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">34</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">109</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac5">19</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac7">89</TD><TD class=alignRight headers="ar1 ar5 ac1 ac8">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">233</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">61</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">1</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">171</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">19</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">1202</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">422</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">18</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">762</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">18</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">5053</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">2560</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">79</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">2414</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">89</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">1408</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">188</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">7</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">1213</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">19</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">7780</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac13">451</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac14">14</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">7315</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">119</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">212</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac5">212</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac6">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">341</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">271</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">10</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">60</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">2</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">22</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">22</TD><TD class=alignRight headers="ar1 ar9 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac11">35</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">35</TD><TD class=alignRight headers="ar1 ar9 ac9 ac16">2</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">3</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac5">3</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">25</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac13">24</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac14">1</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac16">1</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">70</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">70</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac11">241</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac13">16</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">225</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">1</TD></TR><TR><TH id=ar12 class=bg-colour-yellow headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">3661</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">1265</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">68</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">2328</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">83</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">16477</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">5646</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">233</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">10598</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">405</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
(January 6 to January 12, 2013)
</TH><TH id=bc8 colSpan=5>Cumulative
(August 26, 2012 to January 12, 2013)
</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">172</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">11</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">35</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">126</TD><TD class=alignRight headers="br1 br2 bc1 bc7">5</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">1631</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">44</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">546</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">1041</TD><TD class=alignRight headers="br1 br2 bc8 bc14">68</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">48</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">18</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">29</TD><TD class=alignRight headers="br1 br3 bc1 bc7">6</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">892</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">13</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">410</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">469</TD><TD class=alignRight headers="br1 br3 bc8 bc14">66</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">187</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">10</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">44</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">133</TD><TD class=alignRight headers="br1 br4 bc1 bc7">8</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">1995</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">59</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">776</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">1160</TD><TD class=alignRight headers="br1 br4 bc8 bc14">52</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">249</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">9</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">48</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">192</TD><TD class=alignRight headers="br1 br5 bc1 bc7">7</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">2143</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">54</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">747</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">1342</TD><TD class=alignRight headers="br1 br5 bc8 bc14">51</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">955</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">4</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">220</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">731</TD><TD class=alignRight headers="br1 br6 bc1 bc7">11</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">6584</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">30</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">2287</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">4267</TD><TD class=alignRight headers="br1 br6 bc8 bc14">74</TD></TR><TR><TH id=br7 headers=br1>Unknown</TH><TD class=alignRight headers="br1 br7 bc1 bc2 bc3">2</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc4">0</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc5">1</TD><TD class=alignRight headers="br1 br7 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br7 bc1 bc7">0</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc10">65</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">2</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">61</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc13">2</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">1613</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">35</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">366</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">1212</TD><TD class=alignRight headers="br1 br8 bc1 bc7">37</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">13310</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">202</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">4827</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">8281</TD><TD class=alignRight headers="br1 br8 bc8 bc14">311</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
During the 2012-13 season, the National Microbiology Laboratory (NML) has antigenically characterized 248 influenza viruses [172 A(H3N2), 36 A(H1N1)pdm09 , and 40 influenza B]. The 172 influenza A(H3N2) viruses were antigenically similar to the vaccine strain A/Victoria/361/2011 and the 36 A(H1N1)pdm09 viruses were antigenically similar to the vaccine strain A/California/07/09. Among the influenza B viruses, 31 were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) and 9 were similar to B/Brisbane/60/2008 (Victoria lineage; component of the 2011-2012 seasonal influenza vaccine) (Figure 6).
Figure 6. Influenza strain characterizations, Canada, 2012-2013, N = 248
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
During the 2012-13 season, NML has tested 214 influenza viruses for resistance to oseltamivir, and 213 influenza viruses for resistance to zanamivir. All viruses tested were sensitive to oseltamivir and zanamivir. A total of 333 influenza A 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">163</TD><TD class=alignCenter headers="cr2 cc3">0</TD><TD class=alignCenter headers="cr2 cc5">162</TD><TD class=alignCenter headers="cr2 cc6">0</TD><TD class=alignCenter headers="cr2 cc8">306</TD><TD class=alignCenter headers="cr2 cc9">306 (100%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignCenter headers="cr3 cc2">25</TD><TD class=alignCenter headers="cr3 cc3">0</TD><TD class=alignCenter headers="cr3 cc5">25</TD><TD class=alignCenter headers="cr3 cc6">0</TD><TD class=alignCenter headers="cr3 cc8">27</TD><TD class=alignCenter headers="cr3 cc9">27</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignCenter headers="cr4 cc2">26</TD><TD class=alignCenter headers="cr4 cc3">0</TD><TD class=alignCenter headers="cr4 cc5">26</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">214</TD><TD class=alignCenter headers="cr5 cc3">0</TD><TD class=alignCenter headers="cr5 cc5">213</TD><TD class=alignCenter headers="cr5 cc6">0</TD><TD class=alignCenter headers="cr5 cc8">333</TD><TD class=alignCenter headers="cr5 cc9">333 (100%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national influenza-like-illness (ILI) consultation rate increased from 58.7 ILI consultations per 1,000 patient visits in week 01 to 62.1 in week 02. This rate is well above the expected level for this time of year, which is between 24.0 and 42.5 ILI consultations per 1,000 visits (Figure 7). The increased ILI consultation rate may be due in part to ongoing influenza and RSV activity across Canada, as well as increased public attention to the early influenza season. In week 02, the highest consultation rates were observed in children <5 years of age (90.8/1,000) followed by children 5-19 years of age (78.2/1,000).
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)
Pharmacy Surveillance
The Canadian antiviral prescription rate decreased from 337.6 antiviral prescriptions per 100,000 new prescriptions dispensed in week 01 to 285.7 in week 02. In week 02, the antiviral prescription rate decreased for adult and senior age groups, and was stable for infants and children. The highest rate was observed among seniors ≥65 years, at 475.1/100,000. The current proportion of antiviral prescriptions of 285.7/100,000 is higher than the rate observed during the peak period of influenza activity last year (50-100/100,000); however, it continues to follow the trend of the percentage of positive laboratory tests for influenza.
Note: Pharmacy sales data are provided to the Public Health Agency of Canada by Rx Canada Inc. and sourced from major retail drug chains representing over 3,000 stores nationwide (excluding Nunavut) in 85% of Health Regions. Data provided include the number of new antiviral prescriptions (for Tamiflu and Relenza) and the total number of new prescriptions dispensed by Province/Territory and age group.
Severe Respiratory Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths (IMPACT)
In week 02, 51 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported by the Immunization Monitoring Program Active (IMPACT) network, compared to 74 in week 01. Among the 49 cases identified with influenza A, 42 (85.7%) were A(unsubtyped), 6 (12.2%) were A(H3N2) and 1 (2.0%) was A(H1N1)pdm09. Two cases were identified with influenza B. The age distribution is as follows: 10 cases (19.6%) under 6 months of age, 16 (31.4%) between 6-23 months, 16 (31.4%) aged 2-4 years, 8 (15.7%) aged 5-9 years, and 1 (2.0%) aged 10-16 years. Five ICU admissions were reported during this week, four cases between 6-23 months and one aged 2-4 years.
Since the start of the 2012-13 season, a total of 394 influenza-associated paediatric hospitalizations have been reported by the IMPACT network: 380 (96.4%) with influenza A [of which 56 (14.7%) were A(H3N2), 3 (0.8%) were A(H1N1)pdm09 and 321 (84.5%) were A(unsubtyped)], and 14 (3.6%) with influenza B. The distribution of cases by age group is as follows: 90 (22.8%) <6 months of age; 83 (21.1%) age 6-23 months; 112 (28.4%) age 2-4 years; 71 (18.0%) age 5-9 years; and 38 (9.6%) age 10-16 years. Thirty-six of the 394 cases (9.1%) were admitted to the ICU. No deaths have been reported to date.
Note: The number of hospitalizations reported through IMPACT represents a subset of all influenza-associate paediatric hospitalizations in Canada.
Adult Influenza Hospitalizations and Deaths (PCIRN)
In week 02, 44 new laboratory-confirmed influenza-associated adult (16 years of age and older) hospitalizations were reported by the PHAC/CIHR Influenza Research Network (PCIRN) Serious Outcomes Surveillance (SOS) network, compared to 26 in week 01. The age distribution is as follows: 34 cases (77.3%) were ≥65 years of age, 7 cases (15.9%) were aged 45-64 years, and 3 cases (6.8%) were aged 20-44 years. Among the 42 cases identified with influenza A, one was A(H3N2), and the rest were A(unsubtyped). Two cases were identified with influenza B. One ICU admission was reported during the current week in a case of influenza A(unsubtyped) in an individual ≥65 years of age. Three deaths were reported with influenza A(unsubtyped): two individuals were ≥65 years of age, and the third was 45-64 years of age.
From November 4, 2012 to January 12, 2013, a total of 276 influenza-associated adult hospitalizations were reported by the PCIRN-SOS network: 262 (94.9%) with influenza A [of which 30 (11.5%) were A(H3N2), 2 (0.8%) were A(H1N1), and 230 (87.8%) were A(unsubtyped)]; 6 (2.2%) with influenza B, and the type has not yet been reported for 8 (2.9%) cases. The distribution of cases by age group is as follows: 190 cases (68.8%) were aged ≥65 years, 60 cases (21.7%) were aged 45-64 years, 23 cases (8.3%) were aged 20-44 years, and 3 cases (1.1%) were <20 years of age. Thirteen of the 276 cases (4.7%) were admitted to the ICU. Six admissions were in adults aged ≥65 years, three were aged 45-64 years, and four were aged 20-44 years. Of the thirteen ICU admissions, eight cases (61.5%) had at least one comorbidity, one case (7.7%) had no co-morbidities, and four cases (30.8%) had no available information on comorbidities to date. Nine deaths have been reported to date, all in cases with influenza A(unsubtyped). Seven deaths were in adults aged ≥65 years, one was in a person aged 45-64 years, and one was in a person aged 20-44 years. Detailed clinical information on comorbidities is not known for these cases.
Note: The number of hospitalizations reported through PCIRN represents a subset of all influenza-associate adult hospitalizations in Canada.
Provincial/Territorial Influenza Hospitalizations and Deaths (Aggregate Surveillance System<SUP>*</SUP>)
In week 02, 823 laboratory-confirmed influenza-associated hospitalizations were reported*. Ninety eight percent of cases (810/823) were influenza A [42% A(H3); 2.3% A(H1N1)pdm09; 55.7% A(unsubtyped)], and 1.6% (13/823) were influenza B. More than half of the cases (60% 497/823) were ≥65 years of age, 16.5% were adults aged 46-64 years and 13% were children aged 0-4 years. Of the 130 cases with available data, 15.4% (20/130) were admitted to the Intensive Care Unit (ICU). Fifty-one deaths were reported in week 02, the majority of which were persons ≥65 years of age (78.4%; 40/51); 10 were adults aged 45-64 yeas and one was an adult aged 20-44 years. It is important to note that the cause of death does not have to be attributable to influenza, a positive laboratory test is sufficient for reporting. Detailed clinical information (e.g. underlying medical conditions) is not known for these cases.
To date this season, 1675 influenza-associated hospitalizations have been reported. Of these, 97.7% (1636/1675) have been influenza A [predominately A(H3) (45.7%; 748/1636)] and 2.3% have been influenza B. Half of the cases (55.7% 933/1675) were ≥65 years of age, 16.4% (275/1675) were adults aged 45-64 years and 14.4% (241/1675) were children aged 0-4 years. Among the 428 cases with available data, there have been 66 hospitalisations for which admission to ICU was required; 24 were persons ≥65 years of age, 24 were persons aged 45-64 years, 9 were adults aged 20-44 years, 1 was an individual aged 15-19 years, 3 were children aged 5-14 years and 5 were children aged 0-4 years. To date this season, 104 deaths have been reported: 86 were adults aged ≥ 65 years of age, 11 were adults aged 45-64 years; 4 were adults aged 20-44 years; and 3 were children aged 0-4 years. It is important to note that the cause of death does not have to be attributable to influenza, a positive laboratory test is sufficient for reporting. Detailed clinical information (e.g. underlying medical conditions) is not known for these cases.
* Note: The number of new influenza-associated hospitalizations and deaths reported by the Aggregate Surveillance System each week may be overestimated, as it may include retrospective updates to data from Ontario for previous weeks. These data may also include cases reported by the IMPACT and PCIRN networks. 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 Saskatchewan. ICU admissions are not reported in Ontario.
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