H9N2 influenza viruses prevalent in poultry in China are phylogenetically distinct from A/quail/Hong Kongl/G1/97 presumed to be the donor of the internal protein genes of the H5N1 Hong Kong/97 virus

Abstract excerpt

Ten H9N2 influenza virus strains isolated from diseased chickens in different farms in China during 1995 to 1999 were antigenically and genetically characterized. The haemagglutinins of the isolates were not related to those of A/quail/Hong Kong/G1/97 (H9N2) (Qa/HK/G1/97), but were closely related to that of A/chicken/Hong Kong/G9/97 (H9N2) (Ck/HK/G9/97). The neuraminidase of these isolates had a deletion of...

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