我们于1987～1989年,对EHF人群自然感染动态进行了调查,现将结果报告于后。 材料与方法 一、调查点的选择 根据1981～1986年EHF平均发病率,采取分层整群抽样的方法,选回郭镇、北寺村、西村乡、泘沱村为监测调查点。 二、血清来源 分别于EHF流行高峰前(1～3月)及流行高峰后(7～10月),用塑管采末梢血,检测EHFIgG抗体,健康人群每个调查点采血不少于200人,调查村有EHF史能找到的全部采血。 We conducted a survey of the natural infection in EHF population from 1987 to 1989, and the results are reported hereafter. MATERIALS AND METHODS A. Selection of investigation points According to the average incidence of EHF from 1981 to 1986, a stratified cluster sampling method was adopted to select Guozhen, Beisi Village, Xicun Township and Hutuo Village as monitoring and investigation points. Second, the source of serum EHF epidemic peak (January to March) and the peak after the epidemic (July to October), with plastic tube collecting peripheral blood, detection of EHFIgG antibodies, healthy people at each survey point blood sampling of not less than 200 , Investigate all the blood that the village has EHF history can find.