下呼吸道感染是指喉部以下的感染[1]，肺炎、肺脓肿和急性支气管炎均属于下呼吸道感染。症状包括呼吸困难、虚弱、发热、咳嗽和疲劳。[2]对于有下呼吸道感染症状的人，并不总是需要常规的胸部X光检查。[3]
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