Abstract
We isolated eight highly pathogenic H5N8 avian influenza viruses (H5N8 HPAIVs) in the 2014/15 winter season at an overwintering site of migratory birds in Japan. Genetic analyses revealed that these isolates were divided into three groups, indicating the co-circulation of three genetic groups of H5N8 HPAIV among these migratory birds. These results also imply the possibility of global redistribution of the H5N8 HPAIVs via the migration of these birds next winter.
Highlights
We isolated eight highly pathogenic H5N8 avian influenza viruses (H5N8 HPAIVs) in the 2014/15 winter season at an overwintering site of migratory birds in Japan
H5N1 HPAIVs were isolated from seven dead cranes in the 2010/11 winter season [9]
The HA genes of the rest of our isolates (Group C, red in the Figures), as well as a poultry isolate from Japan were clearly distinct from those of the other recent H5N8 isolates. These findings suggest that three genetically distinct groups of H5N8 HPAIVs were independently circulating among the migratory birds at the Izumi plain
Summary
We isolated eight highly pathogenic H5N8 avian influenza viruses (H5N8 HPAIVs) in the 2014/15 winter season at an overwintering site of migratory birds in Japan.
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