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【单选题】
下列哪项不属于医院内感染的主要因素A.
医院内病原体来源广泛，环境污染严重
B.
易感人群增多
C.
有效控制大量新型抗生素的开发和使用
D.
各种侵入性诊疗手段增多
E.
医务人员对医院内感染的严重性认识不足
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皮皮学刷刷变学霸
举一反三
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A.
them
B.
one
C.
it
D.
that
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