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目的 研究云南大山区存在有钉螺孳生而无血吸虫病流行的现象 ,探讨其形成原因。方法 实验区 4～ 6 0岁人群用间接荧光抗体试验 (IFAT)法检测血吸虫抗体 ,对抗体阳性者粪便孵化 ,顶管孵化法检测实验区保虫宿主的粪便 ;采用系统抽样结合环境抽查法对实验区钉螺分布情况进行调查 ,对捕获的钉螺进行解剖 ,观察有无血吸虫尾蚴和胞蚴 ;对区内自然因素及人群接触疫水等方面进行调查分析。结果 IFAT法检测 96 5人血吸虫抗体 ,4例阳性 ,阳性率 0 .4 1%。4名阳性者进行粪便检查 (3送 3检 ) ,均未查见血吸虫虫卵和毛蚴。未查见血吸虫感染的家畜。共调查 14 5个条(块 )环境 ,查出螺点 2 7个 ,螺点面积 374 6 m2 。共捡获钉螺 6 784只 ,经解剖未发现感染性钉螺。结论 云南大山区存在有钉螺无血吸虫病流行地区 ,造成有螺无病区存在的原因可能主要是无足够数量的传染源存在
Objective To investigate the prevalence of schistosomiasis prevalence in the mountainous area of Yunnan province and to explore its possible causes. Methods The test of IFAT in 4 ~ 60-year-old population in the experimental area was used to detect the feces of the infected females and the feces of the host were tested by the tube-hatching method. The systematic sampling combined with environmental sampling In order to investigate the distribution of Oncomelania snails in the experimental area, the captured snails were dissected to observe the presence of Schistosoma japonicum, cercariae and cytosarcoma. The natural factors in the area and contact with the infected population were investigated. Results IFAT method was used to detect 96 5 human schistosome antibodies, 4 were positive and the positive rate was 0.41%. Four positive stool examination (3 get 3 check), did not see the schistosome eggs and miracidia. Did not check the schistosome infection of livestock. A total of 14 5 strips (blocks) of the environment were surveyed, and 2 7 spiral points were found, with an area of 374 6 m2. A total of 6 784 snails were seized, and no infectious snails were found after dissection. Conclusion There is a prevalence area of schistosomiasis schistosomiasis in the mountainous area of Yunnan Province, which may be caused by the existence of a sufficient number of sources of infection