卡介苗接种前测验儿童曾否有结核菌自然或人工感染,国内外采用过不少的方法,我国规定以5个单位旧结素作皮内试验。这个规定是正确的。但我们在实际工作中觉得在某些儿童,5个单位旧结素所引起之反应仍较大,所以希望再减少剂量避免强反应而又能同样的解决 BCG vaccination test whether children have TB or natural or artificial infection, used a lot of methods at home and abroad, our country provides 5 units of old knots for intradermal test. This rule is correct. However, in actual work, we think that in some children, the reaction caused by the old knot of 5 units is still large. Therefore, we hope to reduce the dosage to avoid strong reactions and solve the same problem