江苏省1994～1995年乙型脑炎流行病学分析

An epidemiological Analysis on Epidemic Encephalitis Type B in Jiangsu Province, 1994-1995

对江苏省１９９４～１９９５年流行性乙型脑炎流行特征及１９９０年以来乙脑免疫监测资料进行分析，结果表明，江苏省乙脑得到有效的控制，１９９４～１９９５年乙脑发病率分别降至０．９０４／１０万和０．６７／１０万，疫情呈现低水平的隔年波动，波动幅度与流行前期人群乙脑抗体水平及儿童易感者的累积密切相关；儿童免疫空白和免疫不足的数量增多，人群抗体水平较低，流行波幅就高；降低免疫空白和免疫不足，提高了人群抗体水平，则流行波幅就降低。目前，江苏乙脑病例９８．２３％集中于广大农村，０～７岁儿童仍为主要构成。提示：要达到有效的控制乙脑流行强度的目的，提高免疫成功率，加强免疫监测和疫情趋势预报，都是十分必要的。

Epidemic Encephalitis Type B was controlled effectively in Jiangsu Province in 1994 -1995 . The Incidence rate of Epidemic Encephalitis B was decreased to 0 . 904 per 100000 population in 1994 and 0. 67 per 100000population in 1995 respectively. There was close relation- ship between wave scope and Encephalitis B antibody level in early period of high risk children. When zero - immunization children number was increased and group antibody level was situated at lower level,the epidemic wave scope was high,while group antibody raised, zero- immunization and insufficient immunization were decreased , the epidemic wave scope was low . At present , 98. 23 % cases of Encephalitis B were occured in rural areas and concentrated in 0 - 7 year age group. In order to control Epidemic Encephalitis Type B effectively, the antiepidemic stations at each level should increase the effect-immunization coverage and promot the surveillance & epi- demic trend forcast .