%0 Journal Article %A Surveillance Group for New Influenza A(H1N1) Virus Investigation and Control in Spain, Collective %T New influenza A(H1N1) virus infections in Spain, April-May 2009 %D 2009 %J Eurosurveillance %V 14 %N 19 %P 19209 %R doi:https://doi.org/10.2807/ese.14.19.19209-en %K influenza %K H1N1 %K swine influenza %K novel influenza A(H1N1) %K pandemic %K swine flu %K A(H1N1)v %U https://www.eurosurveillance.org/content/10.2807/ese.14.19.19209-en