题目内容

以下选项中，对肉毒梭菌描述正确的是

A. 能耐受低浓度氧，生长迅速，容易培养，在厌氧血琼脂平板上见典型的“双溶血环”，卵磷脂酶试验阳性、Nagler试验阳性，牛乳培养基中出现“汹涌发酵”现象
B. 专性厌氧菌，37℃培养49小时后，形成扁平、灰白色、边缘疏松呈羽毛状的菌落，有狭窄的β溶血环；在潮湿的血平板上常呈迁徙生长，不易获得单个菌落；在疱肉培养基中，肉汤轻度混浊，肉渣部分消化，微变黑，产生少量气体
C. 细菌本身并不致病，但产生的毒素为已知毒性最剧烈的
D. 感染后可导致抗生素相关伪膜性肠炎
E. 人和动物肠道中重要的正常菌群，能合成多种人体所必需的维生素，拮抗多种肠道病原微生物，故有抗感染、增强机体免疫力、抗肿瘤、调节肠道菌群关系、营养保健和抗衰老等作用

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