每年社区获得性肺炎影响大约450万美国成年人。患社区获得性肺炎的住院患者的病死率每年不同,最高可达35%。肺炎链球菌可导致70%的社区获得性肺炎的病例,而非典型病原体导致30%～40%的病例。尽管我们已经获知有关非典型病原体导致感染的特征,但是在临床、放射学、检验学基础上 Community-acquired pneumonia affects about 4.5 million U.S. adults each year. In-patient mortality from community-acquired pneumonia varies from year to year, up to 35%. Streptococcus pneumoniae can cause 70% of community-acquired pneumonia cases, while the typical pathogen causes 30% to 40% of cases. Although we have learned about the characteristics of atypical pathogens causing infections, on the basis of clinical, radiological and laboratory tests