%0 Journal Article %A van Beek, J %A Ambert-Balay, K %A Botteldoorn, N %A Eden, J S %A Fonager, J %A Hewitt, J %A Iritani, N %A Kroneman, A %A Vennema, H %A Vinjé, J %A White, P A %A Koopmans, M %A on behalf of NoroNet, Collective %T Indications for worldwide increased norovirus activity associated with emergence of a new variant of genotype II.4, late 2012 %D 2013 %J Eurosurveillance %V 18 %N 1 %P 20345 %R doi:https://doi.org/10.2807/ese.18.01.20345-en %K norovirus %U https://www.eurosurveillance.org/content/10.2807/ese.18.01.20345-en