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万县地区包括九县一市,人口760余万。地处四川盆地东部,境内多为丘陵、山区。五十年代以来,中华按蚊为主要传疟媒介,全地区年均气温17.6℃,年均降雨量1209.2mm,相对湿度80％,适于媒介按蚊的生长繁殖和疟原虫在蚊体内的发育。1950～1959年曾发生疟疾暴发流行,患者约35万余人,年均发病率为67.71/万,1951年忠县发病率高达10.56％,病死率为7.12％,恶性疟占50％以上。1985年后为单一间日疟流行,发病率降至1/万
Wanxian area includes nine counties and one city, population 760 million. Located in the eastern Sichuan Basin, mostly in the territory of hills and mountains. Since the 1950s, Anopheles sinensis has been the main vector for transmitting malaria. The annual average temperature in the region is 17.6 ℃ with an average annual rainfall of 1209.2mm and a relative humidity of 80%. It is suitable for the growth and reproduction of Anopheles vectors and the development of malaria parasite in the mosquito . From 1950 to 1959, a malaria outbreak had occurred. About 350,000 people were infected with an annual average incidence of 67.71 per million. In 1951, the incidence of loyalty in Zhong County was as high as 10.56% with a case fatality rate of 7.12% and falciparum malaria accounting for over 50%. After 1985, a single vivax malaria epidemic, the incidence dropped to 1 / 10,000