-
Early season co-circulation of influenza A(H3N2) and B(Yamagata): interim estimates of 2017/18 vaccine effectiveness, Canada, January 2018
-
View Affiliations Hide AffiliationsDanuta M Skowronskidanuta.skowronski bccdc.ca
-
View Citation Hide Citation
Citation style for this article: . Early season co-circulation of influenza A(H3N2) and B(Yamagata): interim estimates of 2017/18 vaccine effectiveness, Canada, January 2018. Euro Surveill. 2018;23(5):pii=18-00035. https://doi.org/10.2807/1560-7917.ES.2018.23.5.18-00035 Received: 22 Jan 2018; Accepted: 31 Jan 2018
- Previous Article
- Table of Contents
- Next Article
Abstract
Using a test-negative design, we assessed interim vaccine effectiveness (VE) for the 2017/18 epidemic of co-circulating influenza A(H3N2) and B(Yamagata) viruses. Adjusted VE for influenza A(H3N2), driven by a predominant subgroup of clade 3C.2a viruses with T131K + R142K + R261Q substitutions, was low at 17% (95% confidence interval (CI): −14 to 40). Adjusted VE for influenza B was higher at 55% (95% CI: 38 to 68) despite prominent use of trivalent vaccine containing lineage-mismatched influenza B(Victoria) antigen, suggesting cross-lineage protection.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Full text loading...