%0 Journal Article %A van der Werf, S %A Lévy-Bruhl, D %T Influenza – the need to stay ahead of the virus %D 2015 %J Eurosurveillance %V 20 %N 5 %P 21030 %R doi:https://doi.org/10.2807/1560-7917.ES2015.20.5.21030 %K vaccine effectiveness %K influenza like illness - ILI %K influenza %U https://www.eurosurveillance.org/content/10.2807/1560-7917.ES2015.20.5.21030