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为了解上海市目前人群流行性乙型脑炎 (乙脑 )免疫水平 ,采用血凝抑制试验 ,于 1998年 9月～ 1999年 2月 ,对上海市区和郊县的部分人群乙脑抗体水平进行了血清学监测 ,并与 80年代的监测结果进行比较。结果显示 :上海市区和郊县乙脑抗体总阳性率分别为 88 15 %和 87 4 6%。未接种过乙脑疫苗的 1岁以下儿童抗体阳性率较低 ,1～ 9岁儿童和 2 0岁以上成人抗体阳性率较高。表明上海市人群中乙脑抗体的阳性率较高 ,原因是 2 0多年来小儿接受高度覆盖的乙脑疫苗接种。在大年龄组 ,70年代以前的乙脑流行在血清学监测中得到反映 ,也可能存在自然感染的不断加强。
In order to understand the current epidemic situation of Japanese encephalitis (JE) in Shanghai, the hemagglutination inhibition test was used to test the level of Japanese encephalitis B (JE) antibody in some population in Shanghai and suburban from September 1998 to February 1999 Serological surveillance was performed and compared with the surveillance results of the 1980s. The results showed that the total positive rate of Japanese encephalitis antibody was 88 15% and 87 4 6% respectively. The antibody positive rate of children under 1 year of age who have not been vaccinated with Japanese encephalitis B vaccine is relatively low. The positive rate of antibodies among children aged 1-9 and adults over 20 years old is high. This indicates that the positive rate of Japanese encephalitis antibodies in the Shanghai population is higher because of the high coverage of JE vaccinated in children over 20 years. In the older age group, the prevalence of Japanese encephalitis before the 1970s was reflected in serological surveillance and there may be a steady increase in natural infection.