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类毒素是经甲醛处理后的()

单选题
2021-12-25 12:48
A、内毒素
B、抗毒素
C、细菌素
D、脱毒外毒素,并保留了抗原性
E、脱毒外毒素,并失去了抗原性
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正确答案
D

试题解析
类毒素是经甲醛处理后的脱毒外毒素,并保留了抗原性。

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