Joint FAO/WHO/WOAH preliminary assessment of recent influenza A(H5N1) viruses - World Health Organization (WHO)

Overview
During 2020, highly pathogenic avian influenza (HPAI) A(H5N1) clade 2.3.4.4b viruses arose from previously circulating influenza A(H5Nx) viruses and spread predominantly via migratory bird… [+1153 chars]

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