AIM:To reveal characteristics and evolutions of PB2 genes of human avian H5N1 influenza strains by analysis on sequences of PB2 gene.METHODS:The PB2 gene of human avian H5N1 influenza in Guangdong was sequenced and the global PB2 genes of strains were searched out from internet.They were analyzed by DNAStar 5.0 by means of studying the revolutionary speeds combining the epidemiological data.RESULTS:PB2 genes of 48 strains during 1997-2006 were homologously classified into two groups:strains during 1997-1998...

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