患儿,8岁,接种过卡介苗。有结核接触史,PPD试验结果为8mm,硬结质软、浅红,3天后反应消失,首先应考虑
A.已感染结核病
B.与接种卡介苗有关
C.体内有活动性结核
D.卡介苗接种无效,应复种
正确答案是B
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