alexa Interim estimates of 2015 16 vaccine effectiveness against influenza A(H1N1)pdm09, Canada, February 2016.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Chambers C, Skowronski DM, Sabaiduc S, Winter AL, Dickinson JA,

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Abstract Using a test-negative design, the Canadian Sentinel Practitioner Surveillance Network (SPSN) assessed interim 2015/16 vaccine effectiveness (VE) against influenza A(H1N1)pdm09 viruses. Adjusted VE showed significant protection of 64\% (95\% confidence interval (CI): 44-77\%) overall and 56\% (95\%CI: 26-73\%) for adults between 20 and 64 years-old against medically attended, laboratory-confirmed A(H1N1)pdm09 illness. Among the 67 A(H1N1)pdm09-positive specimens that were successfully sequenced, 62 (> 90\%) belonged to the emerging genetic 6B.1 subclade, defined by S162N (potential gain of glycosylation) and I216T mutations in the haemagglutinin protein. Findings from the Canadian SPSN indicate that the 2015/16 northern hemisphere vaccine provided significant protection against A(H1N1)pdm09 illness despite genetic evolution in circulating viruses. This article was published in Euro Surveill and referenced in Journal of Vaccines & Vaccination

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