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在1986～1991年间,对我县2500多名中小学生进行了驱虫前后的调查。结果表明;在改厕前的1986～1988年,虽然服药驱虫后学生肠道寄生虫有明显下降,但由于受环境因素和个人卫生习惯的影响,1年后其再
Between 1986 and 1991, more than 2,500 primary and secondary school students in our county were investigated before and after deworming. The results showed that in the period from 1986 to 1988 before toilet restroom, although the intestinal parasites of the students after taking medicine dewormed significantly decreased, but due to environmental factors and personal hygiene habits, one year later