Department of Virology;
Hebei Provincial Sanitary and Antiepidemic Station;
Baoding 071000;
Hebei Province;
China;
Department of Epidemiology;
Shanghai Medical University.Shanghai 200032;
China;
Fucheng County Sanitary and Anti-epidemic Station;
Zhejiang Academy of Medical Sciences;
Hangzhou;
hepatitis; A/prevention; and; control; vaccines; attenuated; inactivated; viral; hepatitis; vaccines; disease; outbreaks; protective; efficacy;