5岁男性患儿，高热、头痛、呕吐2天，昏迷1天，起病前曾排稀便数次，无脓血,未见皮疹，心肺腹无异常，脑膜刺激征阳性，双侧巴氏征阳性，大便常规无异常。血常规：白细胞6x109/L,中性粒细胞0.30,淋巴细胞0.70。最可能的诊断是

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