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Abstract

The Canadian Sentinel Practitioner Surveillance Network reports mid-season 2023/24 influenza vaccine effectiveness (VE) of 63% (95% CI: 51–72) against influenza A(H1N1)pdm09, lower for clade 5a.2a.1 (56%; 95% CI: 33–71) than clade 5a.2a (67%; 95% CI: 48–80), and lowest against influenza A(H3N2) (40%; 95% CI: 5–61). The Omicron XBB.1.5 vaccine protected comparably well, with VE of 47% (95% CI: 21–65) against medically attended COVID-19, higher among people reporting a prior confirmed SARS-CoV-2 infection at 67% (95% CI: 28–85).

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2024-02-15
2024-12-03
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2023/24 mid-season influenza and Omicron XBB.1.5 vaccine effectiveness estimates from the Canadian Sentinel Practitioner Surveillance Network (SPSN)
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Danuta+M+Skowronski&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Skowronski Danuta M</a>, <a href="/search?value1=Yuping+Zhan&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Zhan Yuping</a>, <a href="/search?value1=Samantha+E+Kaweski&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Kaweski Samantha E</a>, <a href="/search?value1=Suzana+Sabaiduc&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Sabaiduc Suzana</a>, <a href="/search?value1=Ayisha+Khalid&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Khalid Ayisha</a>, <a href="/search?value1=Romy+Olsha&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Olsha Romy</a>, <a href="/search?value1=Sara+Carazo&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Carazo Sara</a>, <a href="/search?value1=James+A+Dickinson&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Dickinson James A</a>, <a href="/search?value1=Richard+G+Mather&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Mather Richard G</a>, <a href="/search?value1=Hugues+Charest&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Charest Hugues</a>, <a href="/search?value1=Agatha+N+Jassem&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Jassem Agatha N</a>, <a href="/search?value1=In%C3%A8s+Levade&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Levade Inès</a>, <a href="/search?value1=Maan+Hasso&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Hasso Maan</a>, <a href="/search?value1=Nathan+Zelyas&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Zelyas Nathan</a>, <a href="/search?value1=Ruimin+Gao&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Gao Ruimin</a>, <a href="/search?value1=Nathalie+Bastien&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Bastien Nathalie</a></span>. 2023/24 mid-season influenza and Omicron XBB.1.5 vaccine effectiveness estimates from the Canadian Sentinel Practitioner Surveillance Network (SPSN). <a href="/content/ecdc">Euro Surveill.</a> 2024;29(7):pii=2400076. <a href="https://doi.org/10.2807/1560-7917.ES.2024.29.7.2400076" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2024.29.7.2400076</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 03 Feb 2024;&nbsp;&nbsp; <span class="generated">Accepted</span>: 14 Feb 2024 </span> </p>
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