2岁男孩，突发高热，伴咳嗽，经抗生素治疗3天无效，体温仍高，咳嗽加重伴气促及烦躁。査体：体温390C，呼吸62次/分，心率172次/分，X线胸片有圆形密度增深阴影伴气胸。如诊断明确最适宜的抗生素应首选

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