1990年我市乙脑流行,我们对330例病人进行了个案调查,发现乙脑的发病高峰在7月,与疫情报告乙脑的发病高峰在8月不相符。分析原因是:疫情报告日期比发病日期约推迟一旬,本文对在没有完善的订正措施,仅靠疫情报告确定乙脑的时间分布提出质疑。本年乙脑流行的主要因素是易感人群长期积累,根据我市每次乙脑流行持续两年以上的规律,推测1991年还是流行年。 In 1990, the prevalence of Japanese encephalitis in our city was investigated on a case-by-case basis by 330 patients. The peak of the incidence of Japanese encephalitis was found in July and the peak incidence of Japanese encephalitis in August was inconsistent with that of the epidemic. The reason for the analysis is that the date of the outbreak report was delayed by about one day from the date of onset. This article challenges the time distribution of JE solely on the basis of the outbreak report without any sound corrective measures. The main factor in the epidemic of Japanese encephalitis this year is the long-term accumulation of susceptible people. According to the law that the epidemic of Japanese encephalitis lasts more than two years in our city, it is presumed that 1991 is still a pop-year.