%0 Journal Article %A Mak, G C %A Leung, C K %A Cheng, K C %A Wong, K Y %A Lim, W %T Evolution of the haemagglutinin gene of the influenza A(H1N1)2009 virus isolated in Hong Kong, 2009–2011 %D 2011 %J Eurosurveillance %V 16 %N 9 %P 19807 %R doi:https://doi.org/10.2807/ese.16.09.19807-en %K influenza %K pandemic %K A(H1N1)v %K swine flu %K swine influenza %U https://www.eurosurveillance.org/content/10.2807/ese.16.09.19807-en