Results After levee break in 1998, it resulted in the pervasion of snail in the marshland, the area of snail increased by 56.2 percent, the density of infected snai...

• 结果1998年溃堤后；滩地钉螺面积增加了56.；2%25；灾后阳性螺密度升高；居民感染率呈持续上升趋势；同时引起疫区扩大。结论特大洪水溃堤；将对血吸虫病流行产生严重影响。