单项选择题

患儿男，1岁，腹泻5天，大便4～5次/天，为黄色稀水便，含脓血及黏液。体检：体温38.7℃，皮肤弹性尚可，心肺正常。大便镜检：大量红白细胞。考虑该患儿腹泻的原因可能是

A.轮状病毒感染
B.肠道菌群失凋
C.消化酶分泌减少
D.肠道外感染导致
E.肠内细菌感染
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