肠道寄生虫感染是我国中、小学生，特别是农村学生普遍存在的健康问题。山亭区大部分是山区农村，为了解全区学前儿童肠道寄生虫感染情况，我们于1997年1月～10月，对全区40所小学5～7岁学前儿童进行普查，现报告如下。1临床资料1．1方法：应用生理盐水涂片法检查各类原虫的滋 Intestinal parasitic infection is the prevalence of health problems among primary and middle school students in our country, especially in rural areas. Most of the mountainous areas are mountainous rural areas. To understand the intestinal parasitic infections among preschool children in the region, from January to October 1997, we conducted a survey of preschool children aged 5 to 7 in 40 elementary schools in the region. The report is as follows . 1 Clinical data 1.1 Methods: Application of saline smear method to check the various types of protozoa