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Re: Canada FluWatch Weekly Reports 2011-2012 Season Week 6
Re: Canada FluWatch Weekly Reports 2011-2012 Season Week 6
February 5 to February 11, 2012 (Week 06)
Posted 2012-02-17 For 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/11-12/w06_12/pdf/fw2012-06-eng.pdf" jQuery1329518172025="2">2011-2012 FluWatch: February 5 to February 11, 2012 (Week 06) (<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 06, seven surveillance regions (within <ABBR title="British Columbia ">BC</ABBR>, <ABBR title=Saskatchewan>SK</ABBR>, <ABBR title=Ontario>ON</ABBR>, & <ABBR title=Newfoundland/Labrador>NL</ABBR>) reported localized activity and 20 regions (within BC, <ABBR title=Alberta>AB</ABBR>, SK, ON, <ABBR title=Quebec>QC</ABBR>, <ABBR title="New Brunswick ">NB</ABBR>, <ABBR title="Prince Edward Island ">PEI</ABBR>, & NL) reported sporadic influenza activity (see Figure 1). Eleven outbreaks of influenza were reported this week: 9 in long-term care facilities (7 in ON, 1 in BC & 1 in SK), 1 in a school (in ON) and 1 other (in NL)(Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 6
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, 2011-2012 (N=56)
? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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, 2011-2012
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 proportion of positive influenza tests continued to increase and was 7.6% (263/3,470) for week 06 (Figure 4 & 5). Of the 263 positive influenza detections this week, 154 (59%) were positive for influenza A and 109 (41%) were positive for influenza B. To date this season, the provinces with the highest proportion of influenza B detections compared to influenza A detections include: ON, QC & the Atlantic provinces.
The proportion of influenza virus detections by type/subtype this season to date is as follows: 72.6% influenza A (65.3% - A(H3); 13.6% - A(H1N1)pdm09; 21.0% - unsubtyped) and 27.4% influenza B (Table 1).
Detailed information on age and type/subtype were received on 1,238 cases to date this season (Table 2). The proportions of cases by age group are as follows: 22.2% were < 5 years; 12.1% were between 5-19 years; 24.2% were between 20-44 years; 15.0% were between 45-64 years of age; 26.3% were ≥ 65 years; and 0.2% with age unknown.
In week 06, the proportion of tests positive for <ABBR title="Respiratory syncytial virus">RSV</ABBR>increased slightly to 19.5% (and has fluctuated between 17-19% since week 01) and remains the most prevalent among the other respiratory viruses being detected. The highest percent positives for RSV this week were reported in ON, QC and the Atlantic Region. The proportion of positive tests for the other respiratory viruses remained similar to the previous week (rhinovirus-5.3%; parainfluenza-2.3%; adenovirus-2.3%; <ABBR title="Human metapneumovirus">hMPV</ABBR>4.7%; coronavirus-6.3%). (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, 2011-2012 </CAPTION><THEAD><TR class=bg-colour-blue><TH id=ar1 rowSpan=3>Reporting provinces</TH><TH id=ac1 colSpan=6>Weekly
(February 5 to February 11, 2012)</TH><TH id=ac9 colSpan=6>Cumulative
(August 29, 2010 to February 11, 2012)</TH></TR><TR class=bg-colour-blue><TH id=ac2 colSpan=5 headers=ac1>Influenza A</TH><TH id=ac8 headers=ac1>B</TH><TH id=ac10 colSpan=5 headers=ac9>Influenza A</TH><TH id=ac16 headers=ac9>B</TH></TR><TR class=bg-colour-blue><TH id=ac3 headers="ac1 ac2">A Total</TH><TH id=ac4 headers="ac1 ac2">A(H1)</TH><TH id=ac5 headers="ac1 ac2">A(H3)</TH><TH id=ac6 headers="ac1 ac2">Pand H1N1</TH><TH id=ac7 class=noWrap headers="ac1 ac2">A
( <ABBR title=unsubtyped>Un S</ABBR>)*</TH><TH headers="ac1 ac8">Total</TH><TH id=ac11 headers="ac9 ac10">A Total</TH><TH id=ac12 headers="ac9 ac10">A(H1)</TH><TH id=ac13 headers="ac9 ac10">A(H3)</TH><TH id=ac14 headers="ac9 ac10">Pand H1N1</TH><TH id=ac15 class=noWrap headers="ac9 ac10">A
(Un S) *</TH><TH headers="ac9 ac16">Total</TH></TR></THEAD><TFOOT><TR><TD id=ar13 class=fontSize85 colSpan=13 headers=ar1>* 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-blue headers=ar1><ABBR title="British Columbia ">BC</ABBR></TH><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac3">16</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">15</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">1</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">270</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">257</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">13</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">23</TD></TR><TR><TH id=ar3 class=bg-colour-blue headers=ar1><ABBR title=Alberta>AB</ABBR></TH><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac3">42</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">38</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">3</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">2</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">239</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">219</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">10</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">10</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">21</TD></TR><TR><TH id=ar4 class=bg-colour-blue headers=ar1><ABBR title=Saskatchewan>SK</ABBR></TH><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac3">32</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">22</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">146</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">119</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">8</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">19</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">1</TD></TR><TR><TH id=ar5 class=bg-colour-blue headers=ar1><ABBR title=Manitoba>MB</ABBR></TH><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac3">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac5">0</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">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">9</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">5</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">2</TD></TR><TR><TH id=ar6 class=bg-colour-blue headers=ar1><ABBR title=Ontario>ON</ABBR></TH><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac3">25</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">4</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">19</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">2</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">61</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">171</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">54</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">94</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">23</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">181</TD></TR><TR><TH id=ar7 class=bg-colour-blue headers=ar1><ABBR title=Quebec>QC</ABBR>
</TH><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac3">38</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">2</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">5</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">31</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">35</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">173</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">13</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">154</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">108</TD></TR><TR><TH id=ar8 class=bg-colour-blue headers=ar1><ABBR title="New Brunswick">NB</ABBR>
</TH><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac3">0</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">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">2</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">2</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">4</TD></TR><TR><TH id=ar9 class=bg-colour-blue 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">1</TD></TR><TR><TH id=ar10 class=bg-colour-blue 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">1</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">1</TD></TR><TR><TH id=ar11 class=bg-colour-blue headers=ar1><ABBR title="Newfoundland/Labrador ">NL</ABBR>
</TH><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac3">1</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">1</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">7</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">1</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">1</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">40</TD></TR><TR><TH id=ar12 class=bg-colour-blue headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">154</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">81</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">31</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">42</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">109</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">1012</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">661</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">138</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">213</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">382</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, 2011-2012 * </CAPTION><THEAD><TR class=bg-colour-yellow><TH id=br1 rowSpan=3>Age groups</TH><TH id=bc1 colSpan=5>Weekly
(February 5 to February 11, 2012 (Week 06))</TH><TH id=bc8 colSpan=5>Cumulative
(Aug. 29, 2010 to February 11, 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="bc1 bc2">A Total</TH><TH id=bc4 headers="bc1 bc2">Pandemic H1N1</TH><TH id=bc5 headers="bc1 bc2">A/H3N2</TH><TH id=bc6 headers="bc1 bc2">A unsubtyped</TH><TH headers="bc1 bc7">Total</TH><TH id=bc10 headers="bc8 bc9">A Total</TH><TH id=bc11 headers="bc8 bc9">Pandemic H1N1</TH><TH id=bc12 headers="bc8 bc9">A/H3N2</TH><TH id=bc13 headers="bc8 bc9">A unsubtyped</TH><TH headers="bc8 bc14">Total</TH></TR></THEAD><TFOOT><TR><TD id=br9 class=fontSize85 colSpan=11 headers=br1>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK,MB and ON).
Delays in the reporting of data may cause data to change retrospectively.</TD></TR></TFOOT><TBODY><TR><TH id=br2 headers=br1>< 5</TH><TD class=alignRight headers="br1 br2 bc1 bc2 bc3">14</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">8</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">4</TD><TD class=alignRight headers="br1 br2 bc1 bc7">19</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">181</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">39</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">102</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">40</TD><TD class=alignRight headers="br1 br2 bc8 bc14">94</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">8</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">6</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br3 bc1 bc7">10</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">104</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">9</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">85</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">10</TD><TD class=alignRight headers="br1 br3 bc8 bc14">46</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">22</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">13</TD><TD class=alignRight headers="br1 br4 bc1 bc7">14</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">242</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">21</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">157</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">64</TD><TD class=alignRight headers="br1 br4 bc8 bc14">57</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">19</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">6</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">3</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">10</TD><TD class=alignRight headers="br1 br5 bc1 bc7">3</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">158</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">22</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">95</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">41</TD><TD class=alignRight headers="br1 br5 bc8 bc14">28</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">31</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">3</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">23</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">5</TD><TD class=alignRight headers="br1 br6 bc1 bc7">10</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">266</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">13</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">216</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">37</TD><TD class=alignRight headers="br1 br6 bc8 bc14">60</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">2</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">1</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">1</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">94</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">14</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">47</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">33</TD><TD class=alignRight headers="br1 br8 bc1 bc7">56</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">953</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">105</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">656</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">192</TD><TD class=alignRight headers="br1 br8 bc8 bc14">285</TD></TR></TBODY></TABLE>
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Figure 4. Influenza tests reported and percentage of tests positive, Canada,
by report week, 2011-2012
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, 2011-2012
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 (<ABBR title="National Microbiology Laboratory">NML</ABBR>) has antigenically characterized 242 influenza viruses (73 A/H3N2, 48 A/H1N1 and 121 B). All 73 A/H3N2 viruses (from BC, AB, SK, ON & QC) are antigenically related to A/Perth/16/2009. All 48 A/H1N1 viruses (from BC, ON & QC) are antigenically related to A/California/07/2009. Seventy of the 121 influenza B viruses characterized (from BC, AB, SK, ON, QC & NL) are antigenically related to the vaccine strain B/Brisbane/60/2008 (Victoria lineage). The remaining 51 influenza B viruses (from BC, AB, ON, QC & NB) are antigenically related to the reference virus B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. (Figure 6)
Figure 6. Influenza strain characterizations, Canada, 2011-2012, N = 242
Note: The recommended components for the 2011-2012 Northern Hemisphere influenza vaccine include: A/Perth/16/2009 (H3N2), A/California/7/2009 (H1N1) and B/Brisbane/60/2008.
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 204 influenza viruses for resistance to oseltamivir (by phenotypic assay and/or sequencing) and 200 influenza viruses for resistance to zanamivir (by phenotypic assay) and it was found that all viruses tested were susceptible to oseltamivir and zanamivir. A total of 165 influenza A viruses (110 H3N2 and 55 H1N1) were tested for amantadine resistance; all but one influenza A(H3N2) virus tested 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, 2011-2012 </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 id=cr6 class=fontSize85 colSpan=7 headers=cr1><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=alignRight headers="cr1 cr2 cc1 cc2">68</TD><TD class=alignRight headers="cr1 cr2 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr2 cc4 cc5">66</TD><TD class=alignRight headers="cr1 cr2 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr2 cc7 cc8">110</TD><TD class=alignRight headers="cr1 cr2 cc7 cc9">109 (99.1%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignRight headers="cr1 cr3 cc1 cc2">43</TD><TD class=alignRight headers="cr1 cr3 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr3 cc4 cc5">43</TD><TD class=alignRight headers="cr1 cr3 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr3 cc7 cc8">55</TD><TD class=alignRight headers="cr1 cr3 cc7 cc9">55 (100%)</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignRight headers="cr1 cr4 cc1 cc2">93</TD><TD class=alignRight headers="cr1 cr4 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr4 cc4 cc5">91</TD><TD class=alignRight headers="cr1 cr4 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr4 cc7 cc8">NA <SUP>* </SUP></TD><TD class=alignRight headers="cr1 cr4 cc7 cc9">NA <SUP>* </SUP></TD></TR><TR><TH id=cr5 class="alignLeft bg-colour-blue" headers=cr1>TOTAL</TH><TD class=alignRight headers="cr1 cr5 cc1 cc2">204</TD><TD class=alignRight headers="cr1 cr5 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr5 cc4 cc5">200</TD><TD class=alignRight headers="cr1 cr5 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr5 cc7 cc8">165</TD><TD class=alignRight headers="cr1 cr5 cc7 cc9">164 (99.4%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national ILI consultation rate declined to 31.0 ILI consultations per 1,000 patient visits in week 06 but still remains within the expected levels for this time of year (Figure 7). The highest consultation rates this week were observed in children under 5 (63.0/1,000 visits) and in those 5 to 19 years old (48.9/1,000).
Figure 7. Influenza-like illness (ILI) consultation rates, Canada, by report week, 2011-2012 compared to 1996/97 through to 2010/11 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 Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths
In week 06, 12 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (<ABBR title="Immunization Monitoring Program Active">IMPACT</ABBR>) network. Two hospitalizations were due to influenza A(H3N2) (in AB), 4 due to influenza A (unsubtyped) (in SK & ON) and six were due to influenza B (in BC, AB, ON, QC, & NL).
To date this season, 64 influenza-associated paediatric hospitalizations have been reported through IMPACT (from BC, AB, SK, ON, QC, & NL); 41 (64.1%) were due to influenza A and 23 (35.9%) were due to influenza B.
The proportion of cases by age group is as follows: 20.3% among infants <6 months of age; 18.7% among children 6-23 months of age; 39.1% were between 2-4 years; 14.1% were between 5-9 years; and 7.8% were between 10-16 years.
Note: The number of hospitalizations reported through IMPACT represents a subset of all influenza-associate paediatric hospitalizations in Canada; therefore, the number of hospitalizations included in this report may differ from those reported by other Provincial and Territorial Health Authorities.
Adult Influenza Hospitalizations and Deaths
In week 06, 14 new laboratory-confirmed influenza-associated adult hospitalizations were reported: 9 in ON and 5 in AB. In addition, one influenza-associated death was reported in ON in week 06; the death was in an adult > 65 years old and had influenza B infection.
To date this season, 106 influenza-associated adult hospitalizations have been reported from five provinces (AB, SK, <ABBR title=Manitoba>MB</ABBR>, ON & NL). The proportion of cases by age group is as follows: 23.6% were in those 20-44 years of age; 27.4% were in those 45-64 years of age and 49.1% were in those ≥ 65 years. In addition, 5 adult influenza-associated deaths have been reported to date this season (4 in ON & 1 in MB); all had influenza B infection and all were > 65 years old.
Note: The reason for hospitalization or cause of death does not have to be attributable to influenza in order to be reported. Influenza-associated adult hospitalizations are not reported to PHAC by the following Provinces: BC, QC, & NB. Only hospitalizations that require intensive medical care are reported by SK. ICU admissions are not reported in ON.
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http://www.phac-aspc.gc.ca/fluwatch/11-12/w06_12/index-eng.php
Re: Canada FluWatch Weekly Reports 2011-2012 Season Week 6
February 5 to February 11, 2012 (Week 06)
Posted 2012-02-17 For 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/11-12/w06_12/pdf/fw2012-06-eng.pdf" jQuery1329518172025="2">2011-2012 FluWatch: February 5 to February 11, 2012 (Week 06) (<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 continues to increase gradually; activity remains low in the Territories and in a few other regions across the country
- Seven regions reported localized influenza activity and 20 regions reported sporadic influenza activity
- Eleven outbreaks of influenza were reported this week (9 in <ABBR title="long-term care facilities">LTCF</ABBR>s, 1 in a school and 1 other)
- In week 06, 263 laboratory detections of influenza were reported (31% A/H3, 12% A(H1N1)pdm09, 16% A unsubtyped and 41% B)
- The percent positive for influenza B detections has been increasing over the past several weeks with some provinces having detected more influenza B viruses than influenza A viruses in week 06 (i.e. Ontario and some Atlantic provinces)
- Twenty-six influenza-associated hospitalizations were reported this week (12 paediatric and 14 adult)
- The national <ABBR title="Influenza-like illness">ILI</ABBR> consultation rate declined this week compared to the previous week and remains within expected levels for this time of year.
In week 06, seven surveillance regions (within <ABBR title="British Columbia ">BC</ABBR>, <ABBR title=Saskatchewan>SK</ABBR>, <ABBR title=Ontario>ON</ABBR>, & <ABBR title=Newfoundland/Labrador>NL</ABBR>) reported localized activity and 20 regions (within BC, <ABBR title=Alberta>AB</ABBR>, SK, ON, <ABBR title=Quebec>QC</ABBR>, <ABBR title="New Brunswick ">NB</ABBR>, <ABBR title="Prince Edward Island ">PEI</ABBR>, & NL) reported sporadic influenza activity (see Figure 1). Eleven outbreaks of influenza were reported this week: 9 in long-term care facilities (7 in ON, 1 in BC & 1 in SK), 1 in a school (in ON) and 1 other (in NL)(Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 6
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, 2011-2012 (N=56)
? sub-regions within the province or territory as defined by the provincial/territorial epidemiologist. Graph may change as late returns come in.
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, 2011-2012
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 proportion of positive influenza tests continued to increase and was 7.6% (263/3,470) for week 06 (Figure 4 & 5). Of the 263 positive influenza detections this week, 154 (59%) were positive for influenza A and 109 (41%) were positive for influenza B. To date this season, the provinces with the highest proportion of influenza B detections compared to influenza A detections include: ON, QC & the Atlantic provinces.
The proportion of influenza virus detections by type/subtype this season to date is as follows: 72.6% influenza A (65.3% - A(H3); 13.6% - A(H1N1)pdm09; 21.0% - unsubtyped) and 27.4% influenza B (Table 1).
Detailed information on age and type/subtype were received on 1,238 cases to date this season (Table 2). The proportions of cases by age group are as follows: 22.2% were < 5 years; 12.1% were between 5-19 years; 24.2% were between 20-44 years; 15.0% were between 45-64 years of age; 26.3% were ≥ 65 years; and 0.2% with age unknown.
In week 06, the proportion of tests positive for <ABBR title="Respiratory syncytial virus">RSV</ABBR>increased slightly to 19.5% (and has fluctuated between 17-19% since week 01) and remains the most prevalent among the other respiratory viruses being detected. The highest percent positives for RSV this week were reported in ON, QC and the Atlantic Region. The proportion of positive tests for the other respiratory viruses remained similar to the previous week (rhinovirus-5.3%; parainfluenza-2.3%; adenovirus-2.3%; <ABBR title="Human metapneumovirus">hMPV</ABBR>4.7%; coronavirus-6.3%). (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, 2011-2012 </CAPTION><THEAD><TR class=bg-colour-blue><TH id=ar1 rowSpan=3>Reporting provinces</TH><TH id=ac1 colSpan=6>Weekly
(February 5 to February 11, 2012)</TH><TH id=ac9 colSpan=6>Cumulative
(August 29, 2010 to February 11, 2012)</TH></TR><TR class=bg-colour-blue><TH id=ac2 colSpan=5 headers=ac1>Influenza A</TH><TH id=ac8 headers=ac1>B</TH><TH id=ac10 colSpan=5 headers=ac9>Influenza A</TH><TH id=ac16 headers=ac9>B</TH></TR><TR class=bg-colour-blue><TH id=ac3 headers="ac1 ac2">A Total</TH><TH id=ac4 headers="ac1 ac2">A(H1)</TH><TH id=ac5 headers="ac1 ac2">A(H3)</TH><TH id=ac6 headers="ac1 ac2">Pand H1N1</TH><TH id=ac7 class=noWrap headers="ac1 ac2">A
( <ABBR title=unsubtyped>Un S</ABBR>)*</TH><TH headers="ac1 ac8">Total</TH><TH id=ac11 headers="ac9 ac10">A Total</TH><TH id=ac12 headers="ac9 ac10">A(H1)</TH><TH id=ac13 headers="ac9 ac10">A(H3)</TH><TH id=ac14 headers="ac9 ac10">Pand H1N1</TH><TH id=ac15 class=noWrap headers="ac9 ac10">A
(Un S) *</TH><TH headers="ac9 ac16">Total</TH></TR></THEAD><TFOOT><TR><TD id=ar13 class=fontSize85 colSpan=13 headers=ar1>* 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-blue headers=ar1><ABBR title="British Columbia ">BC</ABBR></TH><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac3">16</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">15</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">1</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">270</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">257</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">13</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">23</TD></TR><TR><TH id=ar3 class=bg-colour-blue headers=ar1><ABBR title=Alberta>AB</ABBR></TH><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac3">42</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">38</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">3</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">2</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">239</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">219</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">10</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">10</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">21</TD></TR><TR><TH id=ar4 class=bg-colour-blue headers=ar1><ABBR title=Saskatchewan>SK</ABBR></TH><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac3">32</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">22</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">146</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">119</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">8</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">19</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">1</TD></TR><TR><TH id=ar5 class=bg-colour-blue headers=ar1><ABBR title=Manitoba>MB</ABBR></TH><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac3">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac5">0</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">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">9</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">5</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">2</TD></TR><TR><TH id=ar6 class=bg-colour-blue headers=ar1><ABBR title=Ontario>ON</ABBR></TH><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac3">25</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">4</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">19</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">2</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">61</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">171</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">54</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">94</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">23</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">181</TD></TR><TR><TH id=ar7 class=bg-colour-blue headers=ar1><ABBR title=Quebec>QC</ABBR>
</TH><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac3">38</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">2</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">5</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">31</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">35</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">173</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">13</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">154</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">108</TD></TR><TR><TH id=ar8 class=bg-colour-blue headers=ar1><ABBR title="New Brunswick">NB</ABBR>
</TH><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac3">0</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">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac2 ac7">0</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">2</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">2</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">4</TD></TR><TR><TH id=ar9 class=bg-colour-blue 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">1</TD></TR><TR><TH id=ar10 class=bg-colour-blue 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">1</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">1</TD></TR><TR><TH id=ar11 class=bg-colour-blue headers=ar1><ABBR title="Newfoundland/Labrador ">NL</ABBR>
</TH><TD class=alignRight headers="ar1 ar11 ac1 ac2 ac3">1</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">1</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">7</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">1</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">1</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">40</TD></TR><TR><TH id=ar12 class=bg-colour-blue headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">154</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">81</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">31</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">42</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">109</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">1012</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">661</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">138</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">213</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">382</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, 2011-2012 * </CAPTION><THEAD><TR class=bg-colour-yellow><TH id=br1 rowSpan=3>Age groups</TH><TH id=bc1 colSpan=5>Weekly
(February 5 to February 11, 2012 (Week 06))</TH><TH id=bc8 colSpan=5>Cumulative
(Aug. 29, 2010 to February 11, 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="bc1 bc2">A Total</TH><TH id=bc4 headers="bc1 bc2">Pandemic H1N1</TH><TH id=bc5 headers="bc1 bc2">A/H3N2</TH><TH id=bc6 headers="bc1 bc2">A unsubtyped</TH><TH headers="bc1 bc7">Total</TH><TH id=bc10 headers="bc8 bc9">A Total</TH><TH id=bc11 headers="bc8 bc9">Pandemic H1N1</TH><TH id=bc12 headers="bc8 bc9">A/H3N2</TH><TH id=bc13 headers="bc8 bc9">A unsubtyped</TH><TH headers="bc8 bc14">Total</TH></TR></THEAD><TFOOT><TR><TD id=br9 class=fontSize85 colSpan=11 headers=br1>* Please note that this table reflects the number of specimens for which demographic information was reported. These represent a subset of all positive influenza cases reported. Five provinces have reported detailed case-by-case data since the beginning of the season (BC, AB, SK,MB and ON).
Delays in the reporting of data may cause data to change retrospectively.</TD></TR></TFOOT><TBODY><TR><TH id=br2 headers=br1>< 5</TH><TD class=alignRight headers="br1 br2 bc1 bc2 bc3">14</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">8</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">4</TD><TD class=alignRight headers="br1 br2 bc1 bc7">19</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">181</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">39</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">102</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">40</TD><TD class=alignRight headers="br1 br2 bc8 bc14">94</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">8</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">1</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">6</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">1</TD><TD class=alignRight headers="br1 br3 bc1 bc7">10</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">104</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">9</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">85</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">10</TD><TD class=alignRight headers="br1 br3 bc8 bc14">46</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">22</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">13</TD><TD class=alignRight headers="br1 br4 bc1 bc7">14</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">242</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">21</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">157</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">64</TD><TD class=alignRight headers="br1 br4 bc8 bc14">57</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">19</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">6</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">3</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">10</TD><TD class=alignRight headers="br1 br5 bc1 bc7">3</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">158</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">22</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">95</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">41</TD><TD class=alignRight headers="br1 br5 bc8 bc14">28</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">31</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">3</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">23</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">5</TD><TD class=alignRight headers="br1 br6 bc1 bc7">10</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">266</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">13</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">216</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">37</TD><TD class=alignRight headers="br1 br6 bc8 bc14">60</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">2</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">1</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">1</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">94</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">14</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">47</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">33</TD><TD class=alignRight headers="br1 br8 bc1 bc7">56</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">953</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">105</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">656</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">192</TD><TD class=alignRight headers="br1 br8 bc8 bc14">285</TD></TR></TBODY></TABLE>
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Figure 4. Influenza tests reported and percentage of tests positive, Canada,
by report week, 2011-2012
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, 2011-2012
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 (<ABBR title="National Microbiology Laboratory">NML</ABBR>) has antigenically characterized 242 influenza viruses (73 A/H3N2, 48 A/H1N1 and 121 B). All 73 A/H3N2 viruses (from BC, AB, SK, ON & QC) are antigenically related to A/Perth/16/2009. All 48 A/H1N1 viruses (from BC, ON & QC) are antigenically related to A/California/07/2009. Seventy of the 121 influenza B viruses characterized (from BC, AB, SK, ON, QC & NL) are antigenically related to the vaccine strain B/Brisbane/60/2008 (Victoria lineage). The remaining 51 influenza B viruses (from BC, AB, ON, QC & NB) are antigenically related to the reference virus B/Wisconsin/01/2010-like, which belongs to the Yamagata lineage. (Figure 6)
Figure 6. Influenza strain characterizations, Canada, 2011-2012, N = 242
Note: The recommended components for the 2011-2012 Northern Hemisphere influenza vaccine include: A/Perth/16/2009 (H3N2), A/California/7/2009 (H1N1) and B/Brisbane/60/2008.
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 204 influenza viruses for resistance to oseltamivir (by phenotypic assay and/or sequencing) and 200 influenza viruses for resistance to zanamivir (by phenotypic assay) and it was found that all viruses tested were susceptible to oseltamivir and zanamivir. A total of 165 influenza A viruses (110 H3N2 and 55 H1N1) were tested for amantadine resistance; all but one influenza A(H3N2) virus tested 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, 2011-2012 </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 id=cr6 class=fontSize85 colSpan=7 headers=cr1><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=alignRight headers="cr1 cr2 cc1 cc2">68</TD><TD class=alignRight headers="cr1 cr2 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr2 cc4 cc5">66</TD><TD class=alignRight headers="cr1 cr2 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr2 cc7 cc8">110</TD><TD class=alignRight headers="cr1 cr2 cc7 cc9">109 (99.1%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignRight headers="cr1 cr3 cc1 cc2">43</TD><TD class=alignRight headers="cr1 cr3 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr3 cc4 cc5">43</TD><TD class=alignRight headers="cr1 cr3 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr3 cc7 cc8">55</TD><TD class=alignRight headers="cr1 cr3 cc7 cc9">55 (100%)</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignRight headers="cr1 cr4 cc1 cc2">93</TD><TD class=alignRight headers="cr1 cr4 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr4 cc4 cc5">91</TD><TD class=alignRight headers="cr1 cr4 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr4 cc7 cc8">NA <SUP>* </SUP></TD><TD class=alignRight headers="cr1 cr4 cc7 cc9">NA <SUP>* </SUP></TD></TR><TR><TH id=cr5 class="alignLeft bg-colour-blue" headers=cr1>TOTAL</TH><TD class=alignRight headers="cr1 cr5 cc1 cc2">204</TD><TD class=alignRight headers="cr1 cr5 cc1 cc3">0</TD><TD class=alignRight headers="cr1 cr5 cc4 cc5">200</TD><TD class=alignRight headers="cr1 cr5 cc4 cc6">0</TD><TD class=alignRight headers="cr1 cr5 cc7 cc8">165</TD><TD class=alignRight headers="cr1 cr5 cc7 cc9">164 (99.4%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national ILI consultation rate declined to 31.0 ILI consultations per 1,000 patient visits in week 06 but still remains within the expected levels for this time of year (Figure 7). The highest consultation rates this week were observed in children under 5 (63.0/1,000 visits) and in those 5 to 19 years old (48.9/1,000).
Figure 7. Influenza-like illness (ILI) consultation rates, Canada, by report week, 2011-2012 compared to 1996/97 through to 2010/11 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 Illness Surveillance
Paediatric Influenza Hospitalizations and Deaths
In week 06, 12 new laboratory-confirmed influenza-associated paediatric (16 years of age and under) hospitalizations were reported through the Immunization Monitoring Program Active (<ABBR title="Immunization Monitoring Program Active">IMPACT</ABBR>) network. Two hospitalizations were due to influenza A(H3N2) (in AB), 4 due to influenza A (unsubtyped) (in SK & ON) and six were due to influenza B (in BC, AB, ON, QC, & NL).
To date this season, 64 influenza-associated paediatric hospitalizations have been reported through IMPACT (from BC, AB, SK, ON, QC, & NL); 41 (64.1%) were due to influenza A and 23 (35.9%) were due to influenza B.
The proportion of cases by age group is as follows: 20.3% among infants <6 months of age; 18.7% among children 6-23 months of age; 39.1% were between 2-4 years; 14.1% were between 5-9 years; and 7.8% were between 10-16 years.
Note: The number of hospitalizations reported through IMPACT represents a subset of all influenza-associate paediatric hospitalizations in Canada; therefore, the number of hospitalizations included in this report may differ from those reported by other Provincial and Territorial Health Authorities.
Adult Influenza Hospitalizations and Deaths
In week 06, 14 new laboratory-confirmed influenza-associated adult hospitalizations were reported: 9 in ON and 5 in AB. In addition, one influenza-associated death was reported in ON in week 06; the death was in an adult > 65 years old and had influenza B infection.
To date this season, 106 influenza-associated adult hospitalizations have been reported from five provinces (AB, SK, <ABBR title=Manitoba>MB</ABBR>, ON & NL). The proportion of cases by age group is as follows: 23.6% were in those 20-44 years of age; 27.4% were in those 45-64 years of age and 49.1% were in those ≥ 65 years. In addition, 5 adult influenza-associated deaths have been reported to date this season (4 in ON & 1 in MB); all had influenza B infection and all were > 65 years old.
Note: The reason for hospitalization or cause of death does not have to be attributable to influenza in order to be reported. Influenza-associated adult hospitalizations are not reported to PHAC by the following Provinces: BC, QC, & NB. Only hospitalizations that require intensive medical care are reported by SK. ICU admissions are not reported in ON.
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http://www.phac-aspc.gc.ca/fluwatch/11-12/w06_12/index-eng.php
