材料及方法一、观察对象1.西安郊区1979年曾进行过普查、81年11月又复查的349人中所检出的38名HBsAg 阳性者、2名HBsAg 阴性的肝炎病人以及4名HBsAg 阳性多发户中的健康接触者。在HBsAg阳性38人中急性肝炎3例,慢性肝炎7例,另有28例1979年普查时为HBsAg 无症状携带者,1981年复查时已转为病人,但发病日期不易明确问出,故单列一项做为观察对象。 Materials and Methods 1.Objectives 1. 38 suburbs of HBsAg-positive, 2 HBsAg-negative, and 4 HBsAg-positive hepatitis B patients were detected in 349 people who reviewed in the suburbs of Xi’an in 1979, Multiple contacts in the household health. Among the 38 HBsAg positive patients, 3 were acute hepatitis, 7 were chronic hepatitis and 28 were asymptomatic carriers of HBsAg at the time of the 1979 census. They were turned to patients in the review in 1981, but the date of onset was not easy to ask explicitly, One as the observation object.