单选题:一岁小儿未接种过卡介苗,PPD阳性表示

题目内容:
一岁小儿未接种过卡介苗,PPD阳性表示 A.近2—3周感染蛄棱
B.体内已有免疫力,不会再感染结核
C.体内有活动结核
D.对结棱无免疫力,需立即接种卡介苗
E.受过结棱感染。不一定有活动结核

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