Interim estimates of 2019/20 vaccine effectiveness during early-season co-circulation of influenza A and B viruses, Canada, February 2020

The 2019/20 vaccine effectiveness reported by the Canadian Sentinel Practioner Surveillance Network suggests that, among non-elderly individuals, about six of 10 cases of medically-attended febrile respiratory illness due to influenza might have been prevented by vaccination. Such substantial vaccine protection despite antigenic mismatch, notably to circulating influenza A(H3N2) and B/Victoria viruses, invites exploration of other factors potentially contributing to VE. Eurosurveillance

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