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1989年4月,我们对青龙县180例0~3岁婴幼儿进行了在冷链及无冷链条件下接种BCG的效果调查。180例均无结核接触史及结核病史,皮内BCG
In April 1989, we investigated the efficacy of BCG vaccination in 180 children aged 0-3 years in Qinglong County under cold-and cold-chain conditions. All 180 patients had no history of tuberculosis exposure and history of tuberculosis, intradermal BCG