Influenza -- Worldwide/Unknown
Since their re-emergence in 2003, highly pathogenic avian influenza A(H5N1) viruses of the A/goose/Guangdong/1/96 haemagglutinin (HA) lineage have become enzootic in some countries, have infected wild birds and continue to cause outbreaks in poultry and sporadic human infections. These viruses have diversified genetically and antigenically, including the emergence of viruses with substitutions of the N1 gene for N2, N3, N6, N8 or N9 genes, leading to the need for multiple CVVs. This summary
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