南京市雨花台区位于长江下游。进入90年代后，其有螺面积一直在33万m2以上，全部是长江江滩。1991年至1994年人群查病检出率在15％。到20％。之间。虽然每年花大力气坚持查、灭螺，查、治病，但收效甚微。有螺面积和人群发病率均无明显下降，且时有急感病人和15岁以下小病人发 Nanjing Yuhuatai District is located in the lower reaches of the Yangtze River. Into the 90’s, its snail area has been more than 330,000 m2, all of the Yangtze River beach. From 1991 to 1994, the detection rate of the crowd was 15%. To 20%. between. Although vigorously insist on each year to check, snail, check, cure, but with little success. Snail area and the incidence of the population were no significant decline, and sometimes acute illness and minor patients under 15 years of age hair