RT Journal Article SR Electronic(1) A1 Lyytikaïnen, O A1 Kuusi, M A1 Snellman, M A1 Virtanen, M J A1 Eskola, J A1 Rönkkö, E A1 Ikonen, N A1 Julkunen, I A1 Ziegler, T A1 Ruutu, P YR 2011 T1 Surveillance of influenza in Finland during the 2009 pandemic, 10 May 2009 to 8 March 2010 JF Eurosurveillance VO 16 IS 27 SP 19908 OP DO https://doi.org/10.2807/ese.16.27.19908-en UL https://www.eurosurveillance.org/content/10.2807/ese.16.27.19908-en