6个月小儿。发热5天，伴频繁咳嗽，喘憋。住院査体：体温39.40C，血压80/60mmHg，嗜睡，面色发灰，呼吸80次/分，双下肺呼吸音减低，叩诊微浊，心率188次/分，心音低钝,肝肋下3cm,腹膨隆，无包块，肠鸣音减弱。血常规：WBC5.6x109/L,N0.40。胸片：双下肺大小不等片状阴影。诊断最可能是

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