社区获得性肺炎(CAP)是指在医院外罹患的感染性肺实质(含肺泡壁即广义上的肺间质)炎症,包括具有明确潜伏期的病原体感染而在入院后平均潜伏期内发病的肺炎。CAP发病率和病死率高的原因与社会人口老龄化、吸烟、伴有基础疾病和免疫功能低下有 Community Acquired Pneumonia (CAP) refers to inflammation of the lungs outside the hospital that infects the parenchyma of the lung, which includes the alveolar walls (broad interstitial lungs), including those with a clear incubation period of pathogen infection and an average incubation period after admission. CAP morbidity and high mortality due to the aging population, smoking, with underlying diseases and immune dysfunction have