为了研究三峡水利工程主要淹没区万县市段的自然疫源性疾病的分布情况 ,我们对该地区的所有自然疫源性疾病和动物宿主进行了流行病学调查。结果表明 ,该地区有 8种自然疫源性疾病 ;在八十年代 ,鼠平均密度为 9 86 % ,并在鼠体中分离出钩端螺旋体和流行性出血热抗原 ;库区自然疫源地分布十分广泛 ,而该地区人群缺乏对相应疾病的保护能力。这些表明自然疫源性疾病对库区人群构成的威胁是明显的。 In order to study the distribution of natural foci of the Wanxian section of the main submerged area of ​​the Three Gorges Project, we conducted an epidemiological survey of all natural foci and animal hosts in the area. The results showed that there were 8 natural foci in the area. In the 1980s, the average density of rats was 9.86%, and Leptospira and epidemic hemorrhagic fever antigens were isolated from mice. Distribution is very wide, and the population of the region lack of protection of the corresponding diseases. These indicate that the threat posed by natural foci to the people in the reservoir area is obvious.