2004shandongH5N1.pdfA / Duck / Shandong / 093 / 2004 was reported to be a reassorted H5N1 avian influenza virus.A phylogenetic study of it was conducted to identify its genotype.A Bayesian phylogenetic analysis of eight separate gene segments and a neighbor-joining analysis of its whole genome demonstrated that it was an the X genotype virus,although this genotype was reported to be replaced by genotype Z in Southern China in 2002.