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我区自1972年开始全面使用流行性乙型脑炎(乙脑)灭活疫苗预防接种,对儿童6个月开始进行基础免疫,以后每年加强。1980年将乙脑列入计划免疫,免疫程序为1、2、6、10周岁。1981年乙脑发病率比1974年以来任何一年都高,为此我们抽样调查和重点分析了免疫程序对1981年乙脑发病的影响。方法与结果对吴县、无锡县的21个公社(每个公社发生乙脑5例以上)进行整群调查,并对乙脑病人作个案调查,还根据公社、大队的儿童计划免疫帐册核对1979～1981年三年的乙脑疫苗免疫情况。1981年7月11日至～8月4日共发生乙脑
Since 1972, our district started full-scale vaccination of Japanese encephalitis (JE) inactivated vaccines and started basic immunization of children at 6 months and strengthened each year thereafter. In 1980, JE was included in the planned immunization and the immunization procedures were 1, 2, 6 and 10 years of age. The incidence of Japanese encephalitis in 1981 was higher than any year since 1974. Therefore, we conducted a sample survey and analyzed the impact of the immunization program on the incidence of Japanese encephalitis in 1981. Methods and Results A total of 21 communes in Wuxian and Wuxi counties (5 commu- nites with JE in each commune) were enrolled in a cluster investigation and a case-by-case survey of JE patients was conducted. ~ Three years of 1981 JE vaccine immunization. JE occurred from July 11 to August 4, 1981