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Repeated seasonal influenza vaccination among elderly in Europe: effects on lab...

Rondy, Marc; Launay, Odile; Castilla, Jesus; Costanzo, Simona; Puig-Barberà, Joan; Gefenaite, Giedre; Larrauri, Amparo; Rizzo, Caterina

In Europe, annual influenza vaccination is recommended to elderly. From 2011 to 2014 and in 2015-16, we conducted a multicentre test negative case control study in hospitals of 11 European countries to measure influenza vaccine effectiveness (IVE) against laboratory confirmed hospitalised influenza among people aged ≥65years. We pooled four seasons data to measure IVE by past exposures to influenza vaccination....


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