2岁患儿，高热，体温39-400C，频咳，喘憋5天住院。査体：精神弱，面色苍灰，口周青，呼吸60次/分，左肺呼吸音低，叩诊浊音，少许细湿啰音。血常规：白细胞8.8X109/L，N0.44,异型淋巴细胞0.01,L0.45。X线胸片示左下肺大片状阴影。诊断最可能是

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