黑龙江省南部数县,1974年秋天突然发生一批高热、昏迷的病人,临床上虽有人疑诊流行性乙型脑炎,但因历年来发病甚少,难于确诊。为了澄清疫情,诊断疫区,我们在五常、双城、肇东、肇源、哈尔滨、安达等地采了部份病人血清进行补体结合试验,茲将结果报告如下。材料及方法在各县医院的协助下,共采了40名病人,54份血清,急性期病人血35份、恢复期病人血19份其中双份血13份。用冰瓶运至哈医大卫生系流行病教研组。分离血清后,部份 In the southern counties of Heilongjiang Province, a group of patients with fever and coma suddenly appeared in the autumn of 1974. Although some people have the clinical suspicion of epidemic encephalitis, they are rarely diagnosed in the past few years. In order to clarify the outbreak and diagnose the epidemic area, we collected the serum of some patients for complement fixation test in Wuchang, Shuangcheng, Zhaodong, Zhaoyuan, Harbin and Anda, etc. The results are reported as follows. Materials and Methods A total of 40 patients, 54 serums, 35 acute patients, 35 convalescent patients and 19 condyloma acuminatum were recovered with the help of hospitals in all counties. Transported with ice bottles to Harbin Medical Epidemiology Teaching and Research Group. Separation of serum, part