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目的 探讨平垸行洪后血吸虫病疫情变化规律及防制对策。方法 前瞻性纵向观察血吸虫病疫情变化以及引洪促淤 ,种植意扬 ,改变钉螺孳生环境等防制措施的效果。结果 废垸内活螺密度呈下降趋势且未发现感染性钉螺 ;废垸外活螺密度变化不大且每年都出现感染性螺 ;滞留在废弃垸内从事生产活动的人群血吸虫感染率较原居民上升 ;尽管废弃垸耕牛大幅度减少 ,但菜牛和羊明显增加 ,且 3年平均感染率分别高达 18.18%、13 .3 3 % ;进入试区活动的人群 70 %以上是外迁返回居民 ,余为渔民、船民、鸭民及其他人员 ,粪检阳性率 3年平均高达 2 4.69% ;洲滩污染以人、牛粪为主。结论 平垸行洪后尽管采取一些防制对策 ,降低了活螺密度 ,但外来人群的感染率和牛、羊的感染率都明显上升 ,废弃垸有可能形成严重的易感地带
Objective To investigate the variation of schistosomiasis after the embankment discharge and its control measures. Methods The prospective longitudinal observation of schistosomiasis epidemic changes as well as promoting flood silt, planting Yi Yang, changing snail breeding environment and other control measures. Results The density of living snails in waste pollutions showed a downward trend and no infective snails were found. The density of living snails in waste pollutions did not change much and appeared infectious spirals every year. The prevalence of schistosoma infection in residents engaged in productive activities was lower than that in indigenous inhabitants The average rate of infection in three years was as high as 18.18% and 13.33% respectively. More than 70% of the population entering the trial area were residents returning to other places, Yu fishermen, boat people, duck and other staff, stool positive rate of 3 years average of up to 2. 4.69%; Island Beach pollution dominated by man and cow dung. Conclusion Although the embankment after the flood line to take some control measures to reduce the live loofah density, but the foreign population infection rates and cattle, sheep infection rates have increased significantly, waste embankment may form a serious susceptibility zone