洞庭湖垸外血吸虫病易感地带野粪分布及与感染螺密度相关研究

Study on the Relationship Between the Distribution of Field Stool and Density of Infected Snail in Endemic Foci of Schistosomiasis Outside Dongting Lake Region

目的探讨洞庭湖垸外血吸虫病易感地带距大堤不同距离湖洲野粪分布特点及与感染螺密度的关系。方法１９８７～１９９４年，选择洞庭湖区３０个村外洲进行了观察。结果，野粪污染湖洲以牛、猪、人为主，离大堤愈近，密度愈高。牛粪在各距离中均占绝大多数，且离堤愈远比例愈高；猪粪集中分布在距大堤３００ｍ内；人粪呈散在分布。结论＜３００ｍ，各年感染螺密度均＞０．００５只／０．１１ｍ２，属一级易感地带，且与野粪密度有直线相关关系；然两者均呈逐年下降之势。３００ｍ外，年间虽有变化。

Objective To understand the relationship between the characteristics of the distribution of field stool and density of infected snails at different distance from snailridden areas. Methods The lake becahes along 30 villages were observed from 1987 to 1994.Results The major field stool to contaminate lake beaches were those of cattle,pigs and human.The stools of cattle ranked first among all the reservoirs and the farther they were from snailridden areas,the more proportion they were.The stools of pig mainly existed within 300m from snailridden areas.The stools of human distributed scatterly. Conclusion The density of infected snail was more than 0.005/0.11m 2 and the infected area distributed mainly within 300m from the snailridden area belonging to the first grade endemic foci. The density of the infected snail was linely related with the density of field stool with the decreasing trend annually.The annual variation for the density of infected snail and the density of field stool were found,but there was no regularity. [