Objective To identify variation and revolution of NP genes of human avian HSNI influenza strains by analysis on sequences of NP gene.Methods NP gene of human avian H5N1 influenza in Guangdong was sequenced and the global NP gene of strains was searched out.They were analyzed by DNAStar5.0 by means of the revolutionary speeds combined the epidemiological data.Results NP gene of 45 strains isolated during 1997—2006 were homologously classified into three groups:strains in 1997—1998,strains in 2004—2005 and st...

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