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在结核病高发的发展中国家,通常建议多针接种卡介苗（BCG）。反复接种可能相当程度地改变结核菌素皮试反应和结核病感染的诊断结果。为此作者研究了纯化蛋白衍生物（PPD）硬结大小与BCG接种针次间的关
In developing countries with high rates of tuberculosis, it is usually advisable to have multiple doses of BCG. Repeated vaccination may considerably alter the diagnostic results of tuberculin skin test and tuberculosis infection. To this end the author studied the purification of protein derivatives (PPD) induration size and BCG vaccination between the second