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【多选题】
葡萄球菌感染中存在的主要问题是
A.
．带菌率高，易引起医院内交叉感染
B.
．营养要求高，细菌很难分离培养
C.
．对常用抗生素易产生耐药性
D.
．抗体对葡萄球菌感染不起保护作用
E.
．感染易于扩散
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