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目的 了解异地血吸虫品系对江苏省沿海残存钉螺的感染性。方法 用安徽省贵池现场感染性钉螺逸出的尾蚴感染家兔所取得的毛蚴 ,以毛蚴与钉螺 2 0∶ 1感染现场采集的钉螺 ,比较钉螺感染率和尾蚴逸出前期。结果 贵池血吸虫对如东、东台和贵池 3地钉螺感染率分别为 4 .35 %、16 .0 0 %和 4 0 .5 8% ,尾蚴平均逸出前期分别为 (72 .6 9± 8.73) d、(6 8.35± 5 .78) d和 (71.5 0± 9.0 7)d,贵池血吸虫对当地钉螺感染率显著高于对江苏沿海钉螺的感染率 (x1 2 =2 4 .5 8,x2 2 =14 .35 ,P <0 .0 1) ,尾蚴逸出前期差异无显著性 (t1 =0 .0 2 35 ,t2 =0 .1732 ,P>0 .1)。结论 江苏沿海地区钉螺在室内能被贵池血吸虫实验感染 ,长江流域血吸虫的输入 ,有可能导致血吸虫病的再流行
Objective To understand the infectivity of surviving schistosomiasis strains to the remaining snails in Jiangsu Province. Methods Infected with cercariae of Oncomelania snails infecting rabbits in Guichi, Anhui province were infected with miracidia. Oncomelania collected at sites of 20 and 1: 0 were inoculated with miracidia and Oncomelania snails. The infection rates of snails and the escape of cercariae were compared. Results The infection rates of snails of Schistosoma japonicum to Rudong, Dongtai and Guichi 3 were 4.35%, 16.0% and 40.58%, respectively. The average cercariae escaping rates were (72.69 ± 8.73) d, (6 8.35 ± 5.78) d, and (71.5 ± 9.07) d, respectively. The infection rates of snails in the ponds were significantly higher than those in the coastal snails (x1 2 = 24.58 , x2 2 = 14.35, P <0.01), there was no significant difference in the early stage of cercariae escaping (t1 = 0.2235, t2 = 0.1732, P> 0.01). Conclusion Oncomelania snails in the coastal area of Jiangsu Province can be infected experimentally by Schistosoma japonicum in the laboratory. The input of schistosomiasis in the Yangtze River may lead to the re-epidemic of schistosomiasis