11个月婴儿，高热5天伴咳喘、嗜睡、面色苍白。査体：左肺背部叩诊稍浊，偶闻少许中、细湿啰音，胸片示左下肺大片阴影。血常规：WBC9x109/L,N0.56。患儿入院后立即用青霉素、氨苄西林抗炎治疗，效果不显著，需尽快作出病原诊断。首先选择的检査是

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