Spatial, Temporal, and Species Variation in Prevalence of Influenza A Viruses in Wild Migratory Birds. - Munster, Vincent J.; Baas, Chantal; Lexmond, Pascal; Waldenström, Jonas; Wallensten, Anders; Fransson, Thord; Rimmelzwaan, Guus F.; Beyer, Walter E. P.; Schutten, Martin; Olsen, Björn; Osterhaus, Albert D. M. E.; Fouchier, Ron A. M. (PLoS Pathogens, 2007)