血吸虫病流行于亚洲、非洲、拉丁美洲的 74个国家 ,曾流行于我国长江流域及其以南的 12个省 (市 )、自治区 ,受威胁的人口达 1亿多人。血吸虫病流行与社会、经济、自然因素有密切关系 ,越来越多的调查研究表明 ,洪涝灾害与血吸虫病流行的关系非常密切。近 10年来长江流域水患频 Schistosomiasis is endemic to 74 countries in Asia, Africa and Latin America. It was endemic to over 12 million people in 12 provinces (cities) and autonomous regions in China’s Yangtze River basin and south of it. The prevalence of schistosomiasis is closely related to social, economic and natural factors. More and more investigations and studies show that the relationship between floods and the prevalence of schistosomiasis is very close. The frequency of flooding in the Yangtze River basin in the past 10 years