1998年6月，我们与县卫生防疫站卫生监测科人员对慈利三中653名学生，进行了正常人群结核菌素（PPD）试验，现将结果报道如下。1对象与方法1．1对象慈利三中高二、高一、初二共15个教学班，三个不同学龄段的男女学生653名，年龄15-18岁。12方法由县防疫站卫生监测科用结核菌素 In June 1998, we carried out the test of normal population tuberculin (PPD) with 653 students in Cili 3rd Hospital with the Health Monitoring Section of the county health and epidemic prevention station. The results are reported as follows. 1 objects and methods 1.1 object Cili three high school, high school, a total of 15 teaching classes, three different age groups of male and female students 653, aged 15-18 years old. 12 methods by the county epidemic prevention station Health Monitoring Section with tuberculin