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目的通过流动水和静态水体中尾蚴感染力的比较研究 ,探索尾蚴在流动水中感染力的规律。方法将逸出的尾蚴定量投入尼龙绢包绕的铁丝筐内 ,在不同水体、不同时段投放哨鼠 ,使其在流动水和静态水体两种状态中被感染。 3 5 d后解剖全部哨鼠 ,检获、计数血吸虫成虫 ,观察不同时间段哨鼠感染率 ,以推断尾蚴在流动水和静态水体中的感染力及其变化情况。结果流水组实验中 ,第 1组 (刚逸出尾蚴 )有 1只哨鼠被感染 ,哨鼠感染率为 1 .1 1 % ( 1 /90 )。静水组实验中 ,有 8组 (刚逸出至逸出 8h前组 ) 1 2只哨鼠被感染 ,感染率为 1 7.65 % ( 1 2 /68)。两组哨鼠感染率经统计学检验 ,( P<0 .0 0 5 ) ,差异有显著性 ,表明静水组哨鼠感染率显著高于流水组。结论实验表明尾蚴在流动水中的感染力明显减弱 ,而静态水中尾蚴的感染力较强。同时随着时间的延长 ,尾蚴就会逐步失去感染力
Objective To compare the infectivity of cercariae in flowing water and static water to find out the rules of infectivity of cercariae in flowing water. Methods The released cercariae were quantitatively put into the wire baskets wrapped with nylon silk, and the rats were inoculated in different water bodies and in different periods to be infected in both flowing water and static water body. After 3 to 5 days, all sentinel mice were dissected, seized and counted for adult schistosomiasis. The infection rates of sentinel mice at different time points were observed to infer the infectivity of cercariae in flowing water and static water and their changes. Results In the water-flow group experiment, one group of mice (group Cercaria larvae) were infected in Group 1, and the infection rate was 1.11% (1/90). In the hydrostatic group experiment, 12 out of 12 groups (just escaped to 8h before escape) were infected with infection rate of 1 7.65% (12/68). The infection rate of the two groups of mice was statistically tested (P <0.05), the difference was significant, indicating that the static water group was significantly higher than the water group infected rats. Conclusion Experiments show that the infectivity of cercariae in flowing water is obviously weakened, while that of cercariae in static water is strong. At the same time as time goes on, cercariae will gradually lose its appeal