某6个月小儿，低热1天伴咳喘，吃奶时有呛咳，哭吵时唇周轻度发绀。査体：体温380C，气促，呼吸50次/分，规则。精神及面色尚可，呼气相延长，两肺呼吸音对称，有较多哮鸣音，心率160次/分，心音强，肝肋下2.5cm。可能的诊断是

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