社区获得性肺炎(community acquired pneumonia,CAP)是指医院外环境中由于微生物入侵引起的肺部炎症。近年来老年CAP发病率呈逐年增加的趋势[1]。老年CAP患者并发症多,免疫损害宿主增加,病原体变迁和抗生素耐药率上升,必须选择抗菌谱广、耐药性小、不良反应轻的药物[2]。我们收集2011年1月至2012年11月我科收治社区获得性肺炎老 Community acquired pneumonia (CAP) refers to inflammation of the lungs caused by microbial invasion outside the hospital environment. In recent years, the incidence of senile CAP showed a trend of increasing year by year [1]. Elderly CAP patients with more complications, increased immune damage host, pathogens and antibiotic resistance changes in the rise, we must choose broad antibacterial spectrum, small drug resistance, adverse reactions to light drugs [2]. We collected from January 2011 to November 2012 our department admitted to community-acquired pneumonia