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作者在扎伊尔共和国的农村中观察左旋四咪唑防治蛔虫病和钩虫病的作用。从18所初级学校中挑选5～18岁的男女学生共4,094人,以一个班级或一个学校为一个实验
The authors observed the effect of levamisole against ascariasis and hookworm in rural Zaire. A total of 4,094 male and female students aged 5 to 18 were selected from 18 junior high schools to conduct experiments in one class or one school