下呼吸道感染是指喉部以下的感染[1]，肺炎、肺膿腫和急性支氣管炎均屬於下呼吸道感染。症狀包括呼吸困難、虛弱、發熱、咳嗽和疲勞。[2]對於有下呼吸道感染症狀的人，並不總是需要常規的胸部X光檢查。[3]
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