近年来由于人口的老龄化,免疫功能受损宿主的增多,并随着抗菌药物的广泛应用与可选药物品种的不断增加,呼吸系统感染病原谱的进一步变迁和耐药菌的涌现,使抗菌药物的应用不仅达不到应有的疗效,而且不良反应明显增多,甚至危及患者的生命。因此,了解目前下呼吸道感染的主要致病菌 In recent years due to population aging, increased immune dysfunction of the host, and with the widespread use of antibacterial drugs and optional drug species continues to increase, the further changes in the respiratory spectrum of infectious disease and the emergence of resistant bacteria, the antibacterial The application of drugs not only failed to achieve the desired effect, but also significantly increased adverse reactions, and even endanger the lives of patients. Therefore, to understand the main pathogens of the current lower respiratory tract infection