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Low 2016/17 season vaccine effectiveness against hospitalised influenza A(H3N2) among elderly: awareness warranted for 2017/18 season.
Rondy, Marc; Gherasim, Alin; Casado, Itziar; Launay, Odile; Rizzo, Caterina; Pitigoi, Daniela; Mickiene, Aukse; Marbus, Sierk D; Machado, Ausenda; Syrjänen, Ritva K; Pem-Novose, Iva; Horváth, Judith Krisztina; Larrauri, Amparo; Castilla, Jesús; Vanhems, Philippe; Alfonsi, Valeria; Ivanciuc, Alina E; Kuliese, Monika; van Gageldonk-Lafeber, Rianne; Gomez, Veronica; Ikonen, Niina; Lovric, Zvjezdana; Ferenczi, Annamária; Moren, Alain
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Low 2016/17 season vaccine effectiveness against hospitalised influenza A(H3N2) among elderly: awareness warranted for 2017/18 season.
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Euro Surveill 2017; 22(41):17000645
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.