患儿男，7岁，8月份发病，发热、腹泻20小 时，伴呕吐2次，初为稀糊状便，后为黏液脓血 便，每次腹泻前均有腹痛。查体:T39°C，腹不 胀，腹软，左下腹压痛，无肌紧张及反跳痛，四肢 温暖。大便镜检WBC 10〜15个/HP，RBC 5〜 10个/HP。最可能的诊断是

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