Low 2016/17 season vaccine effectiveness against hospitalised influenza A(H3N2) among elderly: awareness warranted for 2017/18 season

Abstract : In a multicentre European hospital study we measured influenza vaccine effectiveness (IVE) against A(H3N2) in 2016/17. Adjusted IVE was 17% (95% confidence interval (CI): 1 to 31) overall; 25% (95% CI: 2 to 43) among 65–79-year-olds and 13% (95% CI: −15 to 30) among those ≥ 80 years. As the A(H3N2) vaccine component has not changed for 2017/18, physicians and public health experts should be aware that IVE could be low where A(H3N2) viruses predominate.
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Marc Rondy, Alin Gherasim, Itziar Casado, Odile Launay, Caterina Rizzo, et al.. Low 2016/17 season vaccine effectiveness against hospitalised influenza A(H3N2) among elderly: awareness warranted for 2017/18 season. Eurosurveillance, European Centre for Disease Prevention and Control, 2017, 22 (41), 〈http://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2017.22.41.17-00645〉. 〈10.2807/1560-7917.ES.2017.22.41.17-00645〉. 〈hal-01628517〉

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