大堤外侧隔离沟改造血吸虫易感地带的效果

STUDY ON THE IMPACT OF ISOLATED CANAL AGAINST THE HIGH TRANSMISSION ZONE OF SCHISTOSOMIASIS OUTSIDE EMBANKMENT

目的 研究大堤外侧隔离沟改造血吸虫易感地带的效果。方法 采用纵向和横向对照研究 ,调查隔离沟区域钉螺密度和感染螺密度 ,横向比较居民感染率。结果 改造后 ,试点区域钉螺感染率下降 76.5 0 % -10 0 % ;感染螺密度降低 78.46% -10 0 % ;居民血吸虫感染率下降 45 .65 %。结论 在大堤外侧设置隔离沟既可加固大堤 ,又可改造钉螺孳生环境 ,减少人、畜接触疫水频率 。

Objective To evaluate the impact of isolated canal against the high transmission zone of schistosomiasis outside embankment. Methods the density of snails and infested snails outside embankment were investigated by longitudinal and transverse comparison methods. The infection rate of residents in the experiment group was compared with that in the control group. Results After building up the isolated canal, the rate of infested snail decreased by 76 50%-100%, the density of infested snail reduced by 78 46%-100%, and the infection rate of residents in the experimental group reduced by 45 65% compared with that in the control group. Conclusion Setting up the isolated cannal outside embankment could reinforce the dam, modify the environment of snail habitats, and decrease the frequency of infested water contact of human and animals. So it is important for health of residents.