6个月女婴，因发热、腹泻3天急诊人院。人院前2天突起发热，下午呕吐2次，继而排水样便5-6次，量少。次日热退，吐止，腹泻次数增至每天10余次，尿量减少，神萎，前囟、眼窝凹陷，泪少，咽充血，心肺阴性，皮肤弹性减退。最可能的诊断是

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