在菲律宾有一个消灭日本血吸虫中间宿主四方钉螺的五年计划,是根据1955～1959年在菲律宾莱特进行的试点结果而制订的。试点证明,沼泽排水,清除河流及灌溉沟中的杂草可以控制钉螺;还证明稻田的仔细犁、耙、秧苗行距适当,可以大大减少钉螺数量。一个良好的农业措施可以使钉螺密度下降95%,使所有10岁以下的儿童的发病率从 In the Philippines there is a five-year plan to eliminate the tetrapod snail, the intermediate host of Schistosoma japonicum, based on pilot results conducted in Wright, the Philippines, from 1955 to 1959. Pilot tests have proved that swamp drainage, removal of weeds from rivers and irrigation ditches can control snails, and careful plows, rakes and seedlings have also been shown to be well spaced in rice fields to significantly reduce the number of snails. A good agricultural practice can reduce snail density by 95%, making the incidence of all children under the age of 10 from