男孩，11岁，畏寒发热12天，伴头痛，纳差，轻度咳嗽，偶有恶心。近2天便秘。体检：体温39.50C，热性面容，神萎，心率100次/分,双肺呼吸音稍粗，腹略胀，肝肋下2.5cm,脾肋下1.5cm,血压16/9kPa。该病儿最可能的诊断是

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