| characterization of a non-pathogenic h5n1 influenza virus isolated from a migratory duck flying from siberia in hokkaido, japan, in october 2009. | infection with h5n1 highly pathogenic avian influenza viruses (hpaivs) of domestic poultry and wild birds has spread to more than 60 countries in eurasia and africa. it is concerned that hpaivs may be perpetuated in the lakes in siberia where migratory water birds nest in summer. to monitor whether hpaivs circulate in migratory water birds, intensive surveillance of avian influenza has been performed in mongolia and japan in autumn each year. until 2008, there had not been any h5n1 viruses isola ... | 2011 | 21310090 |