本文作者曾报道植物的119种天然产物在体外有抑制勾虫和粪类元线虫幼虫发育的作用,现用于人体寄生虫病生态学预防的实践。作者在巴西的两个居民区进行了26个月的实验观察:(1)实验区的选择和人口调查;(2)寄生虫学调查;(3)用噻嘧啶和噻苯咪唑进行群众性治疗,10个月后重复治疗;(4)在1个区内引入对寄生虫有抑制作用的香矛 The authors reported that 119 natural products of plants have the effect of inhibiting the development of larval worms and faecal parasites in vitro and are now used in the practice of ecological prevention of human parasitic diseases. The authors conducted 26-month experimental observations in two residential areas in Brazil: (1) selection of experimental areas and population censuses; (2) parasitological investigations; (3) mass treatment with pyrantel and thiabendazole , 10 months after repeated treatment; (4) in a district into the parasite inhibition of the spear