乙型肝炎在我省农村感染较为普遍,有的村庄感染率很高。我们于1975～1978年连续三年对开封县班村开展流行病学调查研究,证实该村系乙型肝炎高发点,并对流行特征及其因素进行了初步研究。调查内容与方法调查内容 1、1975年5月首次全民普查,同时逐户进行流行病学调查,此后间隔3、6、9、12、18、36个月进行全民采血复查。2、受检者每次取静脉血作 SGPT、HBsAg 和抗—HBs 检测;HBsAg 阳性者进一步作 HBeAg、 Hepatitis B infection in rural areas in our province is more common, some villages have a high infection rate. We conducted an epidemiological investigation of the village in Kaifeng County for three consecutive years from 1975 to 1978, confirming the high incidence of hepatitis B in the village and preliminary studies on its epidemiological characteristics and its factors. Survey contents and methods Survey contents 1, the first national general survey in May 1975, at the same time epidemiological investigation by household, then 3,6,9,12,18,36 months after the national blood reexamination. 2, the subjects took venous blood each time for SGPT, HBsAg and anti-HBs test; HBsAg-positive for further HBeAg,