宜昌地区1990年1～8月麻疹累计发病860例,其流行病学主要特征:在地区分布上,集中在长江沿岸和交通便利,人口集中的四个县,占全区总人口数56.30％,麻疹暴发流行的八个乡,占总乡镇数5.93％,且发病占70.93％;在时间分布上,每月均有病例,3月份呈上升趋势,5～6月形成高峰,发病占55.40％,提示了发病季节 The cumulative incidence of measles from January to August 1990 in Yichang was 860. Its epidemiological characteristics are as follows: In terms of its geographical distribution, it is concentrated in four counties along the Yangtze River and with convenient transportation and a concentrated population, accounting for 56.30% of the total population in the region. Eight outbreaks of measles outbreak, accounting for 5.93% of the total number of towns and villages, and the incidence of 70.93%; in the time distribution, there are monthly cases, rising in March, the peak from May to June, the incidence accounted for 55.40% Prompted the onset of the season