Pathfinder
Editor, Senior Moderator
Re: Canada FluWatch Weekly Reports 2012-2013 Season Week 7
Re: Canada FluWatch Weekly Reports 2012-2013 Season Week 7
FluWatch report: February 10 to February 16, 2013 (Week 7)
Posted 2013-02-22For 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/w07_13/pdf/fw2013-07-eng.pdf">FluWatch report: February 10 to February 16, 2013 (Week 7) (<ABBR title="Portable Document Format">PDF</ABBR> Version - 113 <ABBR title=Kilobytes>KB</ABBR> - 8 pages)
?? Help with PDF documents
Overall Influenza Summary
In week 07, 4 regions [in ON(1), QC(1) and NL(2)] reported widespread activity and 19 regions [in BC(1), SK(1), ON(5), QC(2), NB(5), NS(1), PE(1), NL(2) and NU(1)] reported localized activity (Figures 1 and 2). In week 07, 45 new influenza outbreaks were reported: 23 in long-term-care facilities, 3 in hospitals, 5 in schools, and 14 in other facilities or communities (Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 07
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
Top of Page
Influenza and Other Respiratory Virus Detections
The percentage of positive influenza tests decreased from 17.0% in week 06 to 15.2% in week 07 (Figure 4). Among the influenza viruses detected in week 07 (n=926), 86.8% were positive for influenza A viruses [of which 28.6% were A(H3), 8.0% were A(H1N1)pdm09, and 63.4% were A(unsubtyped)] (Table 1). The proportion of influenza B detections has increased over the past 4 weeks from 2.1% in week 03 to 13.2% in week 07(Figure 4). Cumulative influenza virus detections by type/subtype to date are as follows: 96.4% influenza A [35.2% A(H3), 3.1% A(H1N1)pdm09 and 61.7% A(unsubtyped)] and 3.6% influenza B (Table 1).
Detailed information on age and type/subtype has been received for 19,508 cases to date this (Table 2). The proportion of cases by age group is as follows: 13.2% < 5 years; 7.9% between 5-19 years; 15.3% between 20-44 years; 16.7% between 45-64 years of age; 46.9% ≥ 65 years.
The percentage of tests positive for RSV in week 07 (19.6%) was similar to week 06. The percentage of tests positive for rhinovirus increased from 5.7% in week 06 to 7.6% in week 07. The percentages of tests positive for coronavirus and parainfluenza were similar to the previous week at 4.8% and 2.3%, respectively. Other percentages of positive tests increased slightly in week 07: hMPV at 2.9%; adenovirus at 1.5% (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
(February 10 to February 16, 2013)</TH><TH id=ac9 colSpan=6>Cumulative
(August 26, 2012 to February 16, 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>* The specimen was typed as influenza A, but no result for subtyping was available. 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">150</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">90</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">14</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac7">46</TD><TD class=alignRight headers="ar1 ar2 ac1 ac8">21</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac11">1899</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">1462</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">150</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">287</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">181</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">49</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">21</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">21</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">7</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">32</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">2227</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">1770</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">317</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">140</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">197</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">20</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">6</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">9</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">7</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">747</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">466</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">26</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">255</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">81</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">25</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">2</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac7">23</TD><TD class=alignRight headers="ar1 ar5 ac1 ac8">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">562</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">78</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">6</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">478</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">39</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">199</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">65</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">14</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">120</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">30</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">7647</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">3599</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">219</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">3829</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">190</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">135</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">4</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">130</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">27</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">9389</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac13">545</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac14">24</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">8820</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">214</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">134</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">134</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">1308</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">428</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">15</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">865</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">4</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">46</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac5">38</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac6">3</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar9 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac11">232</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac13">162</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac14">4</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac15">66</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">6</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac5">6</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">84</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac13">53</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac14">3</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac15">28</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">40</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">40</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac11">633</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac13">152</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">481</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">4</TD></TR><TR><TH id=ar12 class=bg-colour-yellow headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">804</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">230</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">64</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">510</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">122</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">24728</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">8715</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">764</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">15249</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">913</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
(February 10 to February 16, 2013)</TH><TH id=bc8 colSpan=5>Cumulative
(August 26, 2012 to February 16, 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">54</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">10</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">8</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">36</TD><TD class=alignRight headers="br1 br2 bc1 bc7">12</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">2425</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">141</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">818</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">1466</TD><TD class=alignRight headers="br1 br2 bc8 bc14">152</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">23</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">14</TD><TD class=alignRight headers="br1 br3 bc1 bc7">25</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">1356</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">47</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">611</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">698</TD><TD class=alignRight headers="br1 br3 bc8 bc14">189</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">48</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">9</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">6</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">33</TD><TD class=alignRight headers="br1 br4 bc1 bc7">14</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">2837</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">200</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">1132</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">1505</TD><TD class=alignRight headers="br1 br4 bc8 bc14">142</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">63</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">6</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">50</TD><TD class=alignRight headers="br1 br5 bc1 bc7">9</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">3149</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">195</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">1133</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">1821</TD><TD class=alignRight headers="br1 br5 bc8 bc14">105</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">128</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">3</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">24</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">101</TD><TD class=alignRight headers="br1 br6 bc1 bc7">10</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">9016</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">65</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">3419</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">5532</TD><TD class=alignRight headers="br1 br6 bc8 bc14">137</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">159</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">16</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">141</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">316</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">30</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">52</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">234</TD><TD class=alignRight headers="br1 br8 bc1 bc7">70</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">18942</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">664</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">7254</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">11024</TD><TD class=alignRight headers="br1 br8 bc8 bc14">725</TD></TR></TBODY></TABLE>
Top of Page
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
Top of Page
Influenza strain characterizations
During the 2012-13 season, the National Microbiology Laboratory (NML) has antigenically characterized 569 influenza viruses. The 405 influenza A(H3N2) viruses were antigenically similar to the vaccine strain A/Victoria/361/2011 and the 76 A(H1N1)pdm09 viruses were antigenically similar to the vaccine strain A/California/07/09. Among the influenza B viruses, 73 were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) and 15 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 = 569
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
Top of Page
Antiviral resistance
During the 2012-13 season, NML has tested 517 influenza viruses for resistance to oseltamivir, and 514 influenza viruses for resistance to zanamivir. All viruses tested were sensitive to oseltamivir and zanamivir. A total of 651 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">382</TD><TD class=alignCenter headers="cr2 cc3">0</TD><TD class=alignCenter headers="cr2 cc5">381</TD><TD class=alignCenter headers="cr2 cc6">0</TD><TD class=alignCenter headers="cr2 cc8">589</TD><TD class=alignCenter headers="cr2 cc9">589 (100%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignCenter headers="cr3 cc2">58</TD><TD class=alignCenter headers="cr3 cc3">0</TD><TD class=alignCenter headers="cr3 cc5">56</TD><TD class=alignCenter headers="cr3 cc6">0</TD><TD class=alignCenter headers="cr3 cc8">62</TD><TD class=alignCenter headers="cr3 cc9">62</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignCenter headers="cr4 cc2">77</TD><TD class=alignCenter headers="cr4 cc3">0</TD><TD class=alignCenter headers="cr4 cc5">77</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">517</TD><TD class=alignCenter headers="cr5 cc3">0</TD><TD class=alignCenter headers="cr5 cc5">514</TD><TD class=alignCenter headers="cr5 cc6">0</TD><TD class=alignCenter headers="cr5 cc8">651</TD><TD class=alignCenter headers="cr5 cc9">651 (100%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national influenza-like-illness (ILI) consultation rate increased slightly from 34.2 ILI consultations per 1,000 patient visits in week 06 to 38.0 in week 07, likely due in part to the circulation of other respiratory viruses such as RSV. After 6 weeks with ILI rates above the expected level for this time of year from weeks 52 to 05, the rate has been within the expected range for weeks 06 and 07 (Figure 7). In week 07, the highest consultation rate was observed in children 5-19 years of age (73.9/1,000) followed by children <5 years of age (54.0/1,000).
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 151.0 antiviral prescriptions per 100,000 new prescriptions dispensed in week 06 to 123.3 in week 07; which continues to follow the downward trend in the percentage of positive laboratory tests for influenza. In week 07, the antiviral prescription rate decreased for all age-groups. The highest rate continued to be observed for seniors ≥65 years of age, at 379.9/100,000.
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 07, 22 new laboratory-confirmed influenza-associated paediatric (≤16 years of age) hospitalizations were reported by the Immunization Monitoring Program Active (IMPACT) network, compared to 40 in week 06. Among the 15 cases identified with influenza A, 13 (86.7%) were A(unsubtyped), 1 (6.7%) was A(H3N2) and 1 (6.7%) was A(H1N1)pdm09. Seven cases (31.8%) were identified with influenza B. The age distribution is as follows: 4 cases (18.2%) under 6 months of age, 5 (22.7%) between 6-23 months, 6 (27.3%) 2-4 years of age, 5 (22.7%) 5-9 years of age, and 2 (9.1%) 10-16 years of age. No ICU admissions were reported during week 07.
Since the start of the 2012-13 season, a total of 597 influenza-associated paediatric hospitalizations have been reported by the IMPACT network: 554 (92.8%) with influenza A [of which 67 (12.1%) were A(H3N2), 16 (2.9%) were A(H1N1)pdm09 and 471 (85.0 %) were A(unsubtyped)], and 43 (7.2%) with influenza B. The distribution of cases by age group is as follows: 122 (20.4%) <6 months of age; 137 (22.9%) age 6-23 months; 182 (30.5%) age 2-4 years; 104 (17.4%) age 5-9 years; and 52 (8.7%) age 10-16 years. Fifty-one of the 576 cases (8.5%) 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 07, 39 new laboratory-confirmed influenza-associated adult (≥16 years of age) hospitalizations were reported by the PHAC/CIHR Influenza Research Network (PCIRN) Serious Outcomes Surveillance (SOS) network, compared to 49 in week 06. The majority of hospitalizations continue to be adults aged ≥65 years25 cases (64.1%). Thirty-eight cases identified with influenza A: 37 with influenza A(unsubtyped), and one with influenza A(H3N2). The influenza type has not been reported for one case. Nine ICU admissions were reported during the current week, all with influenza A(unsubtyped). Six of the nine adults admitted to the ICU were ≥65 years of age, two were 45-64 years of age, and one was 20-44 years of age. Three deaths were reported and all identified 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 February 16, 2013, a total of 1,195 influenza-associated adult hospitalizations were reported by the PCIRN-SOS network: 1,130 (94.6%) with influenza A [of which 143 (12.7%) were A(H3N2), 6 (0.5%) were A(H1N1)pdm09, 981 (86.8%) were A(unsubtyped).]; and 24 (2.0%) with influenza B, and the influenza type has not been reported for 41 (3.4%) cases. Among 1,194 cases with available data, the age distribution is as follows: 816 cases (68.3%) were aged ≥65 years, 246 cases (20.6%) were aged 45-64 years, 128 cases (10.7%) were aged 20-44 years, and 4 cases (0.3%) were <20 years of age. Of the 1,195 cases, 111 (9.3%) were admitted to the ICU. The age distribution of those admitted to the ICU is as follows: 65 (58.6%) were in adults ≥65 years of age, 32 (28.8%) were in adults 45-64 years of age, and 14 (12.6%) were in adults 20-44 years of age. Of the adults admitted to the ICU, 33 (29.7%) had at least one co-morbidity, two (1.8%) had no co-morbidities, and 76 (68.5%) had no information to date. A total of 53 deaths have been reported, 7 (13.2%) with influenza A(H3N2), 44 (83.0%) with influenza A(unsubtyped), and 1 (1.9%) with influenza B, and one (1.9%) for which the influenza type has not been reported. Forty-six of the 53 deaths (86.8%) were in adults ≥65 years of age, 6 (11.3%) were adults 45-64 years of age, and 1 (1.9%) was 20-44 years of age. Twenty-three deaths occurred in individuals who had at least one co-morbidity. Detailed clinical information on co-morbidities is not known for the remaining 30 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>)
The number of laboratory-confirmed influenza-associated hospitalizations continued to decline in week 07 (126 compared to 251 in week 06*). The majority of cases were influenza A (95.2%), predominately A(H3). Over half of cases were ≥65 years of age (67/126, 53.2%). Of the 49 cases with available data, 10 (20.4%) were admitted to the Intensive Care Unit (ICU). Twelve deaths were reported: 11 were adults ≥65 years of age, and one 20-44 years of age. 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, 3316 influenza-associated hospitalizations have been reported. Of these, 97.2% have been influenza A, predominately A(H3); and 2.8% have been influenza B. Age information was available for 3260 cases, and the age distribution is as follows: 57.2% ≥65 years; 16.5% 45-64 years; 8.5% 20-44 years; 1.0% 15-19; 3.4% 5-14 years and 13.4% 0-4 years of age. Among the 890 cases with available data, there have been 140 (15.7%) hospitalisations for which admission to ICU was required; the highest proportions were among adults aged 45-64 years of age (37.1%), and ≥65 years of age (35.0%). To date this season, 217 deaths have been reported: 180 (83.0%) were adults ≥65 years of age, 25 (11.5%) were adults 45-64 years; 7 (3.2%) were adults 20-44 years and 5 (2.3%) were children 0-4 years of age. 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.
.../
http://www.phac-aspc.gc.ca/fluwatch/12-13/w07_13/index-eng.php
Re: Canada FluWatch Weekly Reports 2012-2013 Season Week 7
FluWatch report: February 10 to February 16, 2013 (Week 7)
Posted 2013-02-22For 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/w07_13/pdf/fw2013-07-eng.pdf">FluWatch report: February 10 to February 16, 2013 (Week 7) (<ABBR title="Portable Document Format">PDF</ABBR> Version - 113 <ABBR title=Kilobytes>KB</ABBR> - 8 pages)
?? Help with PDF documents
Overall Influenza Summary
- In week 07, several indicators of influenza circulation continued to decrease, including: the percentage of laboratory detections positive for influenza, the number of regions reporting widespread and localized activity, the number of new influenza/ILI outbreaks, and influenza-associated hospitalizations reported by the IMPACT network and by participating provinces and territories.
- The percentage of tests positive for RSV was stable at 19.6% and the percentage of tests positive for rhinovirus increased slightly.
- The ILI consultation rate increased slightly but is within the expected range for this time of year.
In week 07, 4 regions [in ON(1), QC(1) and NL(2)] reported widespread activity and 19 regions [in BC(1), SK(1), ON(5), QC(2), NB(5), NS(1), PE(1), NL(2) and NU(1)] reported localized activity (Figures 1 and 2). In week 07, 45 new influenza outbreaks were reported: 23 in long-term-care facilities, 3 in hospitals, 5 in schools, and 14 in other facilities or communities (Figure 3).
Figure 1. Map of overall Influenza activity level by province and territory,
Canada, Week 07
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
Top of Page
Influenza and Other Respiratory Virus Detections
The percentage of positive influenza tests decreased from 17.0% in week 06 to 15.2% in week 07 (Figure 4). Among the influenza viruses detected in week 07 (n=926), 86.8% were positive for influenza A viruses [of which 28.6% were A(H3), 8.0% were A(H1N1)pdm09, and 63.4% were A(unsubtyped)] (Table 1). The proportion of influenza B detections has increased over the past 4 weeks from 2.1% in week 03 to 13.2% in week 07(Figure 4). Cumulative influenza virus detections by type/subtype to date are as follows: 96.4% influenza A [35.2% A(H3), 3.1% A(H1N1)pdm09 and 61.7% A(unsubtyped)] and 3.6% influenza B (Table 1).
Detailed information on age and type/subtype has been received for 19,508 cases to date this (Table 2). The proportion of cases by age group is as follows: 13.2% < 5 years; 7.9% between 5-19 years; 15.3% between 20-44 years; 16.7% between 45-64 years of age; 46.9% ≥ 65 years.
The percentage of tests positive for RSV in week 07 (19.6%) was similar to week 06. The percentage of tests positive for rhinovirus increased from 5.7% in week 06 to 7.6% in week 07. The percentages of tests positive for coronavirus and parainfluenza were similar to the previous week at 4.8% and 2.3%, respectively. Other percentages of positive tests increased slightly in week 07: hMPV at 2.9%; adenovirus at 1.5% (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
(February 10 to February 16, 2013)</TH><TH id=ac9 colSpan=6>Cumulative
(August 26, 2012 to February 16, 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>* The specimen was typed as influenza A, but no result for subtyping was available. 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">150</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac5">90</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac6">14</TD><TD class=alignRight headers="ar1 ar2 ac1 ac2 ac7">46</TD><TD class=alignRight headers="ar1 ar2 ac1 ac8">21</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac11">1899</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac13">1462</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac14">150</TD><TD class=alignRight headers="ar1 ar2 ac9 ac10 ac15">287</TD><TD class=alignRight headers="ar1 ar2 ac9 ac16">181</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">49</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac5">21</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac6">21</TD><TD class=alignRight headers="ar1 ar3 ac1 ac2 ac7">7</TD><TD class=alignRight headers="ar1 ar3 ac1 ac8">32</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac11">2227</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac13">1770</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac14">317</TD><TD class=alignRight headers="ar1 ar3 ac9 ac10 ac15">140</TD><TD class=alignRight headers="ar1 ar3 ac9 ac16">197</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">20</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac5">6</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac6">9</TD><TD class=alignRight headers="ar1 ar4 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar4 ac1 ac8">7</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac11">747</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac13">466</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac14">26</TD><TD class=alignRight headers="ar1 ar4 ac9 ac10 ac15">255</TD><TD class=alignRight headers="ar1 ar4 ac9 ac16">81</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">25</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">2</TD><TD class=alignRight headers="ar1 ar5 ac1 ac2 ac7">23</TD><TD class=alignRight headers="ar1 ar5 ac1 ac8">4</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac11">562</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac13">78</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac14">6</TD><TD class=alignRight headers="ar1 ar5 ac9 ac10 ac15">478</TD><TD class=alignRight headers="ar1 ar5 ac9 ac16">39</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">199</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac5">65</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac6">14</TD><TD class=alignRight headers="ar1 ar6 ac1 ac2 ac7">120</TD><TD class=alignRight headers="ar1 ar6 ac1 ac8">30</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac11">7647</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac13">3599</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac14">219</TD><TD class=alignRight headers="ar1 ar6 ac9 ac10 ac15">3829</TD><TD class=alignRight headers="ar1 ar6 ac9 ac16">190</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">135</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac5">4</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac6">1</TD><TD class=alignRight headers="ar1 ar7 ac1 ac2 ac7">130</TD><TD class=alignRight headers="ar1 ar7 ac1 ac8">27</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac11">9389</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac13">545</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac14">24</TD><TD class=alignRight headers="ar1 ar7 ac9 ac10 ac15">8820</TD><TD class=alignRight headers="ar1 ar7 ac9 ac16">214</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">134</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">134</TD><TD class=alignRight headers="ar1 ar8 ac1 ac8">1</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac11">1308</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac13">428</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac14">15</TD><TD class=alignRight headers="ar1 ar8 ac9 ac10 ac15">865</TD><TD class=alignRight headers="ar1 ar8 ac9 ac16">4</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">46</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac5">38</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac6">3</TD><TD class=alignRight headers="ar1 ar9 ac1 ac2 ac7">5</TD><TD class=alignRight headers="ar1 ar9 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac11">232</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac13">162</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac14">4</TD><TD class=alignRight headers="ar1 ar9 ac9 ac10 ac15">66</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">6</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar10 ac1 ac2 ac5">6</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">84</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac13">53</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac14">3</TD><TD class=alignRight headers="ar1 ar10 ac9 ac10 ac15">28</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">40</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">40</TD><TD class=alignRight headers="ar1 ar11 ac1 ac8">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac11">633</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac13">152</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac14">0</TD><TD class=alignRight headers="ar1 ar11 ac9 ac10 ac15">481</TD><TD class=alignRight headers="ar1 ar11 ac9 ac16">4</TD></TR><TR><TH id=ar12 class=bg-colour-yellow headers=ar1>Canada</TH><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac3">804</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac4">0</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac5">230</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac6">64</TD><TD class=alignRight headers="ar1 ar12 ac1 ac2 ac7">510</TD><TD class=alignRight headers="ar1 ar12 ac1 ac8">122</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac11">24728</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac12">0</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac13">8715</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac14">764</TD><TD class=alignRight headers="ar1 ar12 ac9 ac10 ac15">15249</TD><TD class=alignRight headers="ar1 ar12 ac9 ac16">913</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
(February 10 to February 16, 2013)</TH><TH id=bc8 colSpan=5>Cumulative
(August 26, 2012 to February 16, 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">54</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc4">10</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc5">8</TD><TD class=alignRight headers="br1 br2 bc1 bc2 bc6">36</TD><TD class=alignRight headers="br1 br2 bc1 bc7">12</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc10">2425</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc11">141</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc12">818</TD><TD class=alignRight headers="br1 br2 bc8 bc9 bc13">1466</TD><TD class=alignRight headers="br1 br2 bc8 bc14">152</TD></TR><TR><TH id=br3 headers=br1>5-19</TH><TD class=alignRight headers="br1 br3 bc1 bc2 bc3">23</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc4">2</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br3 bc1 bc2 bc6">14</TD><TD class=alignRight headers="br1 br3 bc1 bc7">25</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc10">1356</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc11">47</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc12">611</TD><TD class=alignRight headers="br1 br3 bc8 bc9 bc13">698</TD><TD class=alignRight headers="br1 br3 bc8 bc14">189</TD></TR><TR><TH id=br4 headers=br1>20-44</TH><TD class=alignRight headers="br1 br4 bc1 bc2 bc3">48</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc4">9</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc5">6</TD><TD class=alignRight headers="br1 br4 bc1 bc2 bc6">33</TD><TD class=alignRight headers="br1 br4 bc1 bc7">14</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc10">2837</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc11">200</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc12">1132</TD><TD class=alignRight headers="br1 br4 bc8 bc9 bc13">1505</TD><TD class=alignRight headers="br1 br4 bc8 bc14">142</TD></TR><TR><TH id=br5 headers=br1>45-64</TH><TD class=alignRight headers="br1 br5 bc1 bc2 bc3">63</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc4">6</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc5">7</TD><TD class=alignRight headers="br1 br5 bc1 bc2 bc6">50</TD><TD class=alignRight headers="br1 br5 bc1 bc7">9</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc10">3149</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc11">195</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc12">1133</TD><TD class=alignRight headers="br1 br5 bc8 bc9 bc13">1821</TD><TD class=alignRight headers="br1 br5 bc8 bc14">105</TD></TR><TR><TH id=br6 headers=br1>65+</TH><TD class=alignRight headers="br1 br6 bc1 bc2 bc3">128</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc4">3</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc5">24</TD><TD class=alignRight headers="br1 br6 bc1 bc2 bc6">101</TD><TD class=alignRight headers="br1 br6 bc1 bc7">10</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc10">9016</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc11">65</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc12">3419</TD><TD class=alignRight headers="br1 br6 bc8 bc9 bc13">5532</TD><TD class=alignRight headers="br1 br6 bc8 bc14">137</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">159</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc11">16</TD><TD class=alignRight headers="br1 br7 bc8 bc9 bc12">141</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">316</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc4">30</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc5">52</TD><TD class=alignRight headers="br1 br8 bc1 bc2 bc6">234</TD><TD class=alignRight headers="br1 br8 bc1 bc7">70</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc10">18942</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc11">664</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc12">7254</TD><TD class=alignRight headers="br1 br8 bc8 bc9 bc13">11024</TD><TD class=alignRight headers="br1 br8 bc8 bc14">725</TD></TR></TBODY></TABLE>
Top of Page
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
Top of Page
Influenza strain characterizations
During the 2012-13 season, the National Microbiology Laboratory (NML) has antigenically characterized 569 influenza viruses. The 405 influenza A(H3N2) viruses were antigenically similar to the vaccine strain A/Victoria/361/2011 and the 76 A(H1N1)pdm09 viruses were antigenically similar to the vaccine strain A/California/07/09. Among the influenza B viruses, 73 were antigenically similar to the vaccine strain B/Wisconsin/01/2010 (Yamagata lineage) and 15 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 = 569
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
Top of Page
Antiviral resistance
During the 2012-13 season, NML has tested 517 influenza viruses for resistance to oseltamivir, and 514 influenza viruses for resistance to zanamivir. All viruses tested were sensitive to oseltamivir and zanamivir. A total of 651 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">382</TD><TD class=alignCenter headers="cr2 cc3">0</TD><TD class=alignCenter headers="cr2 cc5">381</TD><TD class=alignCenter headers="cr2 cc6">0</TD><TD class=alignCenter headers="cr2 cc8">589</TD><TD class=alignCenter headers="cr2 cc9">589 (100%)</TD></TR><TR><TH id=cr3 class="alignLeft bg-colour-blue" headers=cr1>A (H1N1)</TH><TD class=alignCenter headers="cr3 cc2">58</TD><TD class=alignCenter headers="cr3 cc3">0</TD><TD class=alignCenter headers="cr3 cc5">56</TD><TD class=alignCenter headers="cr3 cc6">0</TD><TD class=alignCenter headers="cr3 cc8">62</TD><TD class=alignCenter headers="cr3 cc9">62</TD></TR><TR><TH id=cr4 class="alignLeft bg-colour-blue" headers=cr1>B</TH><TD class=alignCenter headers="cr4 cc2">77</TD><TD class=alignCenter headers="cr4 cc3">0</TD><TD class=alignCenter headers="cr4 cc5">77</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">517</TD><TD class=alignCenter headers="cr5 cc3">0</TD><TD class=alignCenter headers="cr5 cc5">514</TD><TD class=alignCenter headers="cr5 cc6">0</TD><TD class=alignCenter headers="cr5 cc8">651</TD><TD class=alignCenter headers="cr5 cc9">651 (100%)</TD></TR></TBODY></TABLE>
Influenza-like Illness (ILI) Consultation Rate
The national influenza-like-illness (ILI) consultation rate increased slightly from 34.2 ILI consultations per 1,000 patient visits in week 06 to 38.0 in week 07, likely due in part to the circulation of other respiratory viruses such as RSV. After 6 weeks with ILI rates above the expected level for this time of year from weeks 52 to 05, the rate has been within the expected range for weeks 06 and 07 (Figure 7). In week 07, the highest consultation rate was observed in children 5-19 years of age (73.9/1,000) followed by children <5 years of age (54.0/1,000).
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 151.0 antiviral prescriptions per 100,000 new prescriptions dispensed in week 06 to 123.3 in week 07; which continues to follow the downward trend in the percentage of positive laboratory tests for influenza. In week 07, the antiviral prescription rate decreased for all age-groups. The highest rate continued to be observed for seniors ≥65 years of age, at 379.9/100,000.
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 07, 22 new laboratory-confirmed influenza-associated paediatric (≤16 years of age) hospitalizations were reported by the Immunization Monitoring Program Active (IMPACT) network, compared to 40 in week 06. Among the 15 cases identified with influenza A, 13 (86.7%) were A(unsubtyped), 1 (6.7%) was A(H3N2) and 1 (6.7%) was A(H1N1)pdm09. Seven cases (31.8%) were identified with influenza B. The age distribution is as follows: 4 cases (18.2%) under 6 months of age, 5 (22.7%) between 6-23 months, 6 (27.3%) 2-4 years of age, 5 (22.7%) 5-9 years of age, and 2 (9.1%) 10-16 years of age. No ICU admissions were reported during week 07.
Since the start of the 2012-13 season, a total of 597 influenza-associated paediatric hospitalizations have been reported by the IMPACT network: 554 (92.8%) with influenza A [of which 67 (12.1%) were A(H3N2), 16 (2.9%) were A(H1N1)pdm09 and 471 (85.0 %) were A(unsubtyped)], and 43 (7.2%) with influenza B. The distribution of cases by age group is as follows: 122 (20.4%) <6 months of age; 137 (22.9%) age 6-23 months; 182 (30.5%) age 2-4 years; 104 (17.4%) age 5-9 years; and 52 (8.7%) age 10-16 years. Fifty-one of the 576 cases (8.5%) 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 07, 39 new laboratory-confirmed influenza-associated adult (≥16 years of age) hospitalizations were reported by the PHAC/CIHR Influenza Research Network (PCIRN) Serious Outcomes Surveillance (SOS) network, compared to 49 in week 06. The majority of hospitalizations continue to be adults aged ≥65 years25 cases (64.1%). Thirty-eight cases identified with influenza A: 37 with influenza A(unsubtyped), and one with influenza A(H3N2). The influenza type has not been reported for one case. Nine ICU admissions were reported during the current week, all with influenza A(unsubtyped). Six of the nine adults admitted to the ICU were ≥65 years of age, two were 45-64 years of age, and one was 20-44 years of age. Three deaths were reported and all identified 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 February 16, 2013, a total of 1,195 influenza-associated adult hospitalizations were reported by the PCIRN-SOS network: 1,130 (94.6%) with influenza A [of which 143 (12.7%) were A(H3N2), 6 (0.5%) were A(H1N1)pdm09, 981 (86.8%) were A(unsubtyped).]; and 24 (2.0%) with influenza B, and the influenza type has not been reported for 41 (3.4%) cases. Among 1,194 cases with available data, the age distribution is as follows: 816 cases (68.3%) were aged ≥65 years, 246 cases (20.6%) were aged 45-64 years, 128 cases (10.7%) were aged 20-44 years, and 4 cases (0.3%) were <20 years of age. Of the 1,195 cases, 111 (9.3%) were admitted to the ICU. The age distribution of those admitted to the ICU is as follows: 65 (58.6%) were in adults ≥65 years of age, 32 (28.8%) were in adults 45-64 years of age, and 14 (12.6%) were in adults 20-44 years of age. Of the adults admitted to the ICU, 33 (29.7%) had at least one co-morbidity, two (1.8%) had no co-morbidities, and 76 (68.5%) had no information to date. A total of 53 deaths have been reported, 7 (13.2%) with influenza A(H3N2), 44 (83.0%) with influenza A(unsubtyped), and 1 (1.9%) with influenza B, and one (1.9%) for which the influenza type has not been reported. Forty-six of the 53 deaths (86.8%) were in adults ≥65 years of age, 6 (11.3%) were adults 45-64 years of age, and 1 (1.9%) was 20-44 years of age. Twenty-three deaths occurred in individuals who had at least one co-morbidity. Detailed clinical information on co-morbidities is not known for the remaining 30 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>)
The number of laboratory-confirmed influenza-associated hospitalizations continued to decline in week 07 (126 compared to 251 in week 06*). The majority of cases were influenza A (95.2%), predominately A(H3). Over half of cases were ≥65 years of age (67/126, 53.2%). Of the 49 cases with available data, 10 (20.4%) were admitted to the Intensive Care Unit (ICU). Twelve deaths were reported: 11 were adults ≥65 years of age, and one 20-44 years of age. 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, 3316 influenza-associated hospitalizations have been reported. Of these, 97.2% have been influenza A, predominately A(H3); and 2.8% have been influenza B. Age information was available for 3260 cases, and the age distribution is as follows: 57.2% ≥65 years; 16.5% 45-64 years; 8.5% 20-44 years; 1.0% 15-19; 3.4% 5-14 years and 13.4% 0-4 years of age. Among the 890 cases with available data, there have been 140 (15.7%) hospitalisations for which admission to ICU was required; the highest proportions were among adults aged 45-64 years of age (37.1%), and ≥65 years of age (35.0%). To date this season, 217 deaths have been reported: 180 (83.0%) were adults ≥65 years of age, 25 (11.5%) were adults 45-64 years; 7 (3.2%) were adults 20-44 years and 5 (2.3%) were children 0-4 years of age. 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.
.../
http://www.phac-aspc.gc.ca/fluwatch/12-13/w07_13/index-eng.php
