１９９８年１０月中旬，在开展人体肠道线虫粪检监测时，对济南乡村儿童蛲虫感染情况进行了入户调查。对象和方法抽样方法根据地理位置、经济收入、卫生状况等，采用分层整群随机抽样法，在我市上、中、下３个等级的历城区、平阴县及商河县抽取自然村常住户，凡有１２岁及... In mid-October 1998, during the surveillance of human intestinal nematode droppings, a survey was conducted on the incidence of pinworm infections in rural areas of Jinan. Object and method Sampling method According to the geographical position, economic income, health status and so on, the stratified cluster random sampling method was used to extract natural villages in three districts of Licheng, Pingyin and Shanghe, Households, who have 12 years old and ...