临澧县1970年被国家确定为基本消灭血吸虫病县,近几年来钉螺已消灭的地区死灰复燃。1990年钉螺面积58.73万m~2,较1987年间回升了9.7倍,流行区域由9个村扩大到21个村,流行区人口由1万人增加到19万人,尤以合口镇螺情回升甚为严重,1977年有螺面积不足1332m~2,1990年 Linfen County was identified by the country as a basic schistosomiasis era in 1970. In recent years, the area where snails have been destroyed has resurrected. In 1990, the area of ​​oncomelania was 587,300 m2, which was 9.7 times more than in 1987. The popular area was expanded from 9 villages to 21 villages, and the population in popular areas increased from 10,000 to 190,000 people, especially in the town of Luokou. Very serious, with a snail area less than 1332m2 in 1977, 1990