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当前学科：儿内科综合练习
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4个月婴儿，咳嗽2天，喘憋1天入院。查体：体温38℃，呼吸60次/min，心率160次/min，烦躁不安，面色尚红润，口周微绀，满肺喘鸣音，并可闻及少许细湿啰音，肝肋下2cm。下列哪项检查能帮助快速诊断（）
A . A.血常规
B . 免疫酶标法测鼻咽拭子或痰中病原
C . 鼻咽拭子分泌物进行病毒分离
D . X线胸片
E . 痰培养、血培养
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