结核菌素皮内试验,仍然是目前进行结核病自然感染调查及考核卡介苗接种后阳转率的经济、有效的方法。旧结素由于成份不纯,能引起较多的非特异性反应,所以国外已采用纯结核蛋白衍化物制成的结素如PPD—S来代替旧结素。我国近年来已生产出自己的纯结素PPD—C,并开始试用。为了比较PPD—C与OT在调查自然感染中局部反应有无差异,以评定国产PPD—C的质量是否合乎要求,我们采用PPD—C及OT对7岁以内儿童进行了自然感染调查的自身对照观察。现将结果报告如下。一、对象与方法: 1.以固原县七营乡7岁以內未种过卡 Tuberculin skin test is still the current investigation of natural infection with tuberculosis and assess the rate of positive after BCG vaccination economic and effective method. Old knot element because of impurities in the composition, can cause more non-specific reaction, so foreign countries have adopted pure TB protein derivatives made of knot such as PPD-S instead of nodules. In recent years, China has produced its own pure knot PPD-C, and began trial. In order to compare PPD-C with OT in investigating whether there is any difference in local reaction in natural infection and to assess whether the quality of domestic PPD-C is satisfactory, we used PPD-C and OT to self-control natural infection in children under 7 years old Observed. The results reported below. First, the object and methods: 1. Guyuan County seven camps have not been planted within 7 years of card