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为了评价我县直机关儿童的卡苗接种工作质量及免疫效果，我们于1997年4月4日～11日对我辖区四所小学的一年级及五年级学生分别进行了新生儿初种7年后和学龄儿童复种1年后PPD试验反应情况调查，其结果报告如下。1材料与方法1．1试验用PPD由北京高科生命科学技术开发公司供应的人
In order to evaluate the quality and immunization effect of vaccination of children vaccinated by the organs directly under the county in our county, we carried out the first seven years of newborns for first and fifth grade students in four primary schools in our area from April 4 to April 11, 1997, respectively After and school-age children one year after the PPD test response survey, the results are reported as follows. 1 Materials and Methods 1.1 Test with PPD by Beijing Hi-Tech Life Science and Technology Development Company supply of people