Recent H5N1 avian Influenza A virus increases rapidly in virulence to mice after a single passage in mice

Abstract excerpt

To evaluate the potential pathogenicity to mammals of the recent H5N1 avian influenza A virus, viruses recovered from dead mice infected with A/chicken/Yamaguchi/7/2004 isolated in Japan were examined. All recovered viruses from the brains of dead mice infected with this strain (without any prior adaptation to mice) had substituted the amino acid at position 627 of the PB2 protein from glutamic acid to lysine....

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