3Kim M C, Kwon Y K, Joh S J, et al. Recent Korean isolates of duck hepatitis virus revealed the presence of a new geno- and serotype when compared to duck hepatitis virus type 1 type st rains[J]. Arch Virol, 2007,152 : 2059-2072.
4Tseng C H, Tsai H J. Molecular characterization of a new sero- type of duck hepatitis virus[J]. Virus Res,2007,126:19-31.
5Wang L, Pan M, Fu Y, et al. Classification of duck hepatitis virus into three genotypes based on molecular evolutionary a- nalysis[J]. Virus Genes, 2008,37 : 52-59.