2Mason WS, Seal G, Summers J. Virus of Pekin ducks with structural and biologicai relatednss lo human hepatitis B virus [ J ]. J Viral, 1980.36:829 - 836.
8Kundgen R,Thoma C, Kock J, et al. Inhibition of duck hepatitisB virusreplication by intrahepatic expression of an antiviralresistancegene[ J]. J Mol Meal,2002,80(3) :187 - 195.