9岁男孩。1周前曾吃生凉瓜,近日出现腹痛腹泻,伴里急后重,体温38.7℃。查血常规自细胞11×109/L,N 90%,L 10%,大便常规:脓液(++),红细胞8个/HP,白细胞12个/HP。最可能的诊断是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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