1990年唐河县发生乙脑病人241例,死亡6例,发病率21.1/10万,病死率2.49％。发病时间集中在七月中、下旬,农村与城镇发病率无显著差异。男女发病比1.39:1。发病年龄以15岁以下儿童为主。临床表现以中型多见(40.66％),轻型次之(28.62％)。1990年发病情况与历年相比属较大流行年。对15例患者采取双份血清,经补体结合试验,抗体均4倍以上增长。流行因素:1990年6～9月本县平均气 In 1990, 241 cases of JE patients and 6 deaths occurred in Tanghe County, with an incidence rate of 21.1 / 100,000 and a case fatality rate of 2.49%. The onset time concentrated in mid-July, late, no significant difference between rural and urban incidence. Male to female incidence than 1.39: 1. The age of onset of children under 15 years of age. More common in the clinical manifestations of medium-sized (40.66%), followed by light (28.62%). The incidence in 1990 compared with the calendar year is a larger epidemic. Double-sera were taken from 15 patients, and the antibody was increased by 4 times by complement fixation test. Prevalence factors: June to September 1990, the county average gas