| origin of highly pathogenic h5n1 avian influenza virus in china and genetic characterization of donor and recipient viruses. | genetic analysis of all eight genes of two nanchang avian influenza viruses, a/duck/nanchang/1681/92 (h3n8-1681) and a/duck/nanchang/1904/92 (h7n1-1904), isolated from jiangxi province, china, in 1992, showed that six internal genes of h3n8-1681 virus and five internal (except ns gene) genes of h7n1-1904 virus were closely similar to a/goose/guangdong/1/96 (h5n1) virus, the first highly pathogenic avian influenza (hpai) virus of subtype h5n1 isolated in asia. the neuraminidase (na) gene of gs/gd ... | 2007 | 17947535 |