目的　了解汉寿县目坪湖垸外血吸虫易感地带影响因素。方法　于 1995 - 1998年对目坪湖垸外沿湖堤村人畜活动、居民接触疫水行为、耕牛放牧以及野粪污染情况进行调查 ,分别用 Kato-Katz法和粪便孵化法调查渔民和耕牛血吸虫感染率 ,用哨鼠法测定水体感染性 ,计算本地渔民、外洲活动渔民和耕牛相对传播指数。结果　沿湖 3个村居民接触疫水率为 46 .0 % ,其中捕鱼占5 2 .6 %、放牧占 15 .9%。距湖堤 10 0 m以内 ,一层村居民疫水暴露率占总暴露率的 94.4%。在观察区内拾野粪 46 2 9份 ,其中牛粪 42 5 9份 ,占 92 .0 % ;孵化法粪检 1135份 ,阳性 5 1份 ,阳性率4.1% ,其中阳性牛粪 46份 ,占 90 .2 %。水体感染性测定 ,共解剖小鼠 1176只 ,平均感染率 16 .9%。本地副业渔民、外洲活动专业渔民、湖洲散放耕牛血吸虫感染分别为 2 5 .87%、40 .6 0 %和 15 .6 8% ,相对传播指数为 1.35 %、5 .82 %和 92 .83%。 Objective To understand the influencing factors of Schistosoma japonicum susceptible zone outside Mu Ping Lake in Hanshou County. Methods In 1995-1998, the investigation of human and livestock activities, contact with water, cattle grazing and stool pollution were conducted in Yanbidi Village outside the lake embankment. The Kato-Katz method and stool incubation method were used to investigate the relationship between fishermen and tillage The rate of infection of bovine schistosomiasis was determined by the semaphore method, and the relative transmission index of local fishermen, foreign fishermen and cattle was calculated. Results The epidemic rates of contact among the three villages along the lake were 46.0%, of which 52.6% were for fishing and 15.9% for grazing. Within 10 m from the lake embankment, the exposure rate of flood water to residents in the first floor layer accounted for 94.4% of the total exposure rate. In the observation area, 462 9 parts of wild feces were collected, of which 4259 were cow dung, accounting for 92.0%; 1135 were hatched fecal seized and 51 were positive, with a positive rate of 4.1%, of which 46 were positive cow dung, Accounting for 90.2%. Water infectivity determination, a total of 1176 mice were dissected, with an average infection rate of 16.9%. The prevalence of schistosomiasis among local sideline fishermen, professional fishermen from other continents and lakes in lakes and hilly areas were 25.87%, 40.60% and 15.68% respectively. The relative transmission indices were 1.35%, 5.82% and 92 .83%.