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poster avian influenza virus h5n1 outbreaks highly pathogenic outbreak bird flu aiv zoonotic potential situation update subtype outbreak flu update h5n1 information h9n2 h5n8 viruses hpai lpai symptoms sick chicken h7n3 h7n9 report update typography mutations genetics farms farmer broiler layer meat egg production protein structure amino acid base genes neuraminidase ha h5 immunity vaccines vaccination mortality death dead bird flu 3d