凉山彝族山区日本血吸虫病流行因素及规律研究

STUDY ON EPIDEMIC FACTORS AND REGULARITY OF SCHISTOSOMIASIS JAPONICA IN MOUNTAINOUS DISTRICT OF LIANGSHAN YI AUTOUOMOUSPREFECTURE

对凉山彝族自治州普格县彝族山区的日本血吸血病流行因素及流行规律研究结果表明,牛是血吸虫病最主要的传染源,3～8岁的牛IPC较高;以牛粪为主的野粪是很重要的传播因素;田边水沟和道路边沟的螺情很严重(阳性螺占有螺面积的62%),是最危险的易感地带.31～40岁的人感染率较高.人和牛间的RTI分别是2.6%和97.4%.人粪中,一个可孵出血吸虫的卵到达钉螺孽生地的机率为0.401～0.620.

A study on epidemic factors and regularity of Schistosomiasis japonica in the mountainous Yizu area in Puge county,Liangshan Yizu Autonomous Prefecture was conducted in 1987-1989, The results showed that the cattle were the most principal source of the Schistosomiasis infection. IPC (Index of Potential contamination) of cattle at the age of 3-8 years old was much higher. Feces on the pasture, the majority of which was excreted by cattle, were very important transmission factors. The ditches beside paddy fields and roads were the most dangerous susceptive zone because of serious Onco-melania, area of Positive Oncomclania is 62% of Oncomelania area. Infection rate of human being at the age of 31-40 years old was higher. RTI (Relative Transmission Index) between human being and cattle were 2.6% and 97.4% respectively. The opportunity rate, of which a hatchable Schistosoma egg in feces of human being got to the place where Oncomelanin lived in, was 0.401-0.620.