目的观察洲垸亚型血吸虫病疫情纵向变化规律及影响因素。方法对观察点五一村居民病情、疫水接触史、家畜病情和螺情进行纵向观察。结果2002~2005年居民粪检阳性率分别为17.84%、11.44%、12.28%、12.05%。居民疫水暴露率、血吸虫感染率、感染度及再感染率,男性都高于女性,渔民及副业渔民明显高于其他职业人群。粪检阳性者化疗后一年内疫水暴露率93.44%,居民重复感染率为29.89%。2002~2005年耕牛粪检阳性率10.69%~17.50%。三峡建坝前(1993年)目平湖7~8月洪水期平均水位比建坝后的2002~2005年高1~2m,其他月份平均水位建坝后比建坝前高。五一外洲感染螺分布广泛,2003年春季钉螺感染率达0.90%,感染螺平均密度0.0263只/0.1m2。2003~2005年钉螺调查,春季阳性钉螺密度及感染率明显高于秋季,活螺平均密度秋季明显高于春季。2006年春季调查未发现阳性钉螺。垸外草洲栽种欧美杨,当地耕牛存栏数量减少,由常年敞放改为轮值群放。结论该型疫区人、畜血吸虫感染率及再感染率高,垸外易感地带须因地制宜采取综合防治措施。 Objective To observe the vertical variation of schistosomiasis in Chauzhou embankment and its influencing factors. Methods Longitudinal observation was conducted on the residents’ disease, history of exposure to faecal water, domestic animal disease and snail in Wuyi village. Results The positive rates of fecal examination from 2002 to 2005 were 17.84%, 11.44%, 12.28% and 12.05% respectively. Resident population exposure to water, schistosomiasis infection rate and re-infection rate, men are higher than women, fishermen and fisherfolk was significantly higher than other occupational groups. Stool detection positive within one year after chemotherapy water exposure rate of 93.44%, residents repeated infection rate was 29.89%. The positive rate of cattle manure from 2002 to 2005 was 10.69% ~ 17.50%. Before the Three Gorges Dam Construction (1993), the mean water level of the Muping Lake from July to August was 1-2m higher than that from 2002 to 2005 after it was built. The average water level of other months was higher after the dam was built than before the dam. In May 2001, the number of infection snails in other continents was extensive. In the spring of 2003, the infection rate of snails was 0.90% and the average infection density was 0.0263 /0.1m2.2003-2005 years. The density and infection rate of positive snails in spring were significantly higher than those in autumn, The average density was significantly higher in autumn than in spring. No positive snails were found in the spring 2006 survey. Embankment grassland planted Europe and the United States Yang, the local population of cattle population decreased, from the perennial open to the rotating group. Conclusion The prevalence rate of human and animal schistosomiasis and the rate of re-infection in this type of endemic area are high. Therefore, comprehensive prevention and control measures should be taken according to local conditions in susceptible areas outside the embankment.