近代长江流域血吸虫病的流行变迁及规律

Rule and Changes of Epidemic of Schistosomiasis in Yangtze River Valley in Modern China

本文通过对近代长江流域钉螺分布及血吸虫病流行的研究，认为近代长江中下游地区由于河、湖泥沙淤积、围垦等因素，天然调蓄防洪能力在下降，使得洪水灾害在近几个世纪一直呈上升趋势，长江洲滩成为钉螺保存地及扩散源，使中下游流域内血吸虫病难以被消灭，而山丘型钉螺则由于残留环境地势复杂，也难以彻底消灭，因此。

Through the study on epidemic of schistosomiasis and distribution of oncomelania snail in Yangtze River valley, it is claimed that due to the deposit of sand and mud and reclaiming land from marshes, the capacity of preventing flood was decreased and there was a tendency of increassing flooding disaster during the last centuries. Thus, the valley became an origin and reservoir of the snails, resulting in the difficulty for the eradication of the snail in the middle and lower valley. Moreover, the complicated condition of mountainous area made the snails very difficult to be eradicated, resulting prominently in the endangerment of schistosomiasis in the present century.