女12岁,急起腹泻、呕吐6小时,共吐泻30余次,开始为黄色稀便,后转为清水样便就诊时大便已无法计数,呈米泔水样查体:体温36.5℃,脉搏160次/分,血压9.1/6.1kPa(68/46mmHg)大便常规:米泔水样,RBC0~2个/HP,WBC0~3个/HP.大便悬滴可见穿梭状快速运动的细菌。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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