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本文将国内五个生物制品研究所生产的不同效价的结素制品分别与国内标准结素H—PPD—C进行同体双臂对比观察。从阳性检出率看上海＞长春＞兰州＞北京＞成都，但是，各生研所制品相互间无显著性差异。综合结果表明，上海所生产的OT效价比较稳定，无论是结素反应阳性率还是硬结均径可与国内标准结素相媲美。
In this paper, five domestic Institute of Biological Products produced different titers of products with the domestic standard knot H-PPD-C were observed on both arms of the same body. From the positive detection rate Shanghai> Changchun> Lanzhou> Beijing> Chengdu, however, all kinds of research institutes products between each other no significant difference. The comprehensive results show that the OT titer produced in Shanghai is relatively stable, both the positive rate of tuberculin reaction and the average callus can be compared with the domestic standard.