题目内容
下列对条件致病菌表述错误的是( )
2021-10-08
A.机体正常时一般不致病
B.机体免疫力下降时可致病
C.寄居部位改变时可致病
D.菌群失调时致病
E.由其引起的体内感染称外艟性感染
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