Global patterns of seasonal influenza activity, duration of activity and virus (sub)type circulation from 2010 to 2020.

ABSTRACT:

Background

Seasonal influenza viruses undergo unpredictable changes, which may lead to antigenic mismatch between circulating and vaccine strains and to a reduced vaccine effectiveness. A continuously updated knowledge of influenza strain circulation and seasonality is essential to optimize the effectiveness of influenza vaccination campaigns. We described the global epidemiology of influenza between the 2009 A(H1N1)p and the 2020 COVID-19 pandemic.

Methods

Influenza virological surveillance data were obtained from the WHO-FluNet database. We determined the median proportion of influenza cases caused by the different influenza virus types, subtypes, and lineages; the typical timing of the epidemic peak; and the median duration of influenza epidemics (applying the annual aver

SUBMITTER: Zanobini P 

PROVIDER: S-EPMC9178051 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature