h5n1 avian influenza re-emergence of lake qinghai: phylogenetic and antigenic analyses of the newly isolated viruses and roles of migratory birds in virus circulation.highly pathogenic avian influenza h5n1 virus has swept west across the globe and caused serious debates on the roles of migratory birds in virus circulation since the first large-scale outbreak in migratory birds of lake qinghai, 2005. in may 2006, another outbreak struck lake qinghai and six novel strains were isolated. to elucidate these qh06 viruses, the six isolates were subjected to whole-genome sequencing. phylogenetic analyses show that qh06 viruses are derived from the lineages of lake q ...200818272760
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