呼吸系统感染是一种较为常见的疾病。在肺部感染的各种病原中,以细菌占首位(成人约占80％,儿童约占60％),其次为病毒、支原体等,少数体质弱或长期应用广谱抗菌药物的患者还可能出现霉菌感染。 一般而言,由于肺组织血供丰富,多数抗菌药物可在肺组织中达一定浓度,但由于血-肺或血-支气管屏障作用的存 Respiratory infection is a more common disease. Among the various pathogenic bacteria in the lungs, bacteria account for the top (about 80% for adults and about 60% for children), followed by viruses and mycoplasma. A few patients with weak physique or long-term use of broad-spectrum antibiotics may also appear Mold infection. In general, most of the antimicrobial agents can reach a certain concentration in the lung tissue due to abundant blood supply in the lung tissue, but due to the action of the blood-lung or blood-bronchial barrier