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In winter 2020–2021, Japan experienced multiple serious outbreaks of H5N8 high pathogenicity avian influenza (HPAI)—52 outbreaks at poultry farms and 58 cases in wild birds or the environment—that occurred simultaneously with outbreaks in Europe. Here, we examined how the H5N8 HPAI viruses (HPAIVs) emerged and spread through Japan and across the Eurasian continent. Phylogenetic and phylogeographic...
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