Volume 13, Number 3—March 2007

Research

Surveillance of Influenza Virus A in Migratory Waterfowl in Northern Europe

Anders Wallensten*†, Vincent J. Munster‡, Neus Latorre-Margalef§, Mia Brytting¶, Johan Elmberg#, Ron A.M. Fouchier‡, Thord Fransson**, Paul D. Haemig§, Malin Karlsson¶, Åke Lundkvist¶, Albert D.M.E. Osterhaus‡, Martin Stervander††, Jonas Waldenström§‡‡, and Björn Olsen§§§ 

Author affiliations: *Smedby Health Center, Kalmar, Sweden; †Linköping University, Linköping, Sweden; ‡Erasmus Medical Center, Rotterdam, the Netherlands; §Kalmar University, Kalmar, Sweden; ¶Swedish Institute for Infectious Disease Control, Solna, Sweden; #Kristianstad University, Kristianstad, Sweden; **Swedish Museum of Natural History, Stockholm, Sweden; ††Ottenby Bird Observatory, Degerhamn, Sweden; ‡‡Lund University, Lund, Sweden; §§Umeå University, Umeå, Sweden;

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Figure 5

Figure 5. Mean influenza A virus prevalence in the 4 age classes. Birds that we were unable to age correctly were denoted as unaged. Bars indicate standard error.

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