2Provost PJ, Conti PA. Studies in chimpanzees of live, attenuated hepatitis A vaccine candidates. Proc Soc Exp Biol Med, 1983,172:357
3Midthun K, Ellerbeck E, Gershman K et al . Safety and immunogenicity of a live attenuated hepatitis A virus vaccine in seronegative volunteers.J Infect Dis, 1991,163:735
4Provost PJ, Conti PA. Studies in chimpanzees of live, attenuated hepatitis A vaccine candidates. Proc Soc Exp Biol Med, 1983, 172: 357.
5Midthun K, Ellerbeck E, Gershman K, et al. Safety and immunogenicity of a live attenuated hepatitis A virus vaccine in seronegative volunteers. J Infect Dis, 1991, 163: 735.
6Provost PJ,Conti PA,Studies in chimpanzees of live attenuated hepatitis Avaccine candidates .Proc Soc Exp Biol Med 1983,172:375
7Midthun K,Ellerbeck E,Gershman K et al.Safety and immunogenicity of a live attenuated hepatitis Avirus vaccine in seronegatibe volunteers.J Lnfect dis,1991,163:735
