单选题：知识点：霍乱弧菌霍乱弧菌的致病因素，不包括：

题目内容：

知识点：霍乱弧菌
霍乱弧菌的致病因素，不包括： A．鞭毛
B．茸毛
C．荚膜
D．肠毒素
E．内毒素

参考答案：

答案解析：

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