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调查对象为本院所在地区在校学生,来自50个行政村,4所中学。调查方法采用随机抽样方法。每份粪便标本均采取直接涂片和饱和盐水漂浮两种方法
The survey was conducted in the area where the institute is located, from 50 administrative villages and 4 secondary schools. Survey method using a random sampling method. Each stool specimens were taken direct smear and saturated saline floating two ways