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调查２００例经纤支镜保护刷取样或连续三日晨痰或一日晨痰定量培养获明确致病菌的院内、外肺炎患者。除院外感染１组外余均有基础疾病。院内组８７．２％致病菌为革兰氏阴性菌，以绿脓杆菌、克雷伯杆菌为主。无基础疾病的院外１组有７５％为革兰氏阳性菌，主要有肺炎链球菌、金黄色葡萄球菌。院外２组革兰氏阴性菌占７５％，绿脓杆菌、不动杆菌、克雷伯菌为其主要致病菌。院内组及院外２组较院外１组复合感染多，细菌耐药严重，预后差。
Investigate 200 cases of bronchoscopy brush protection or three consecutive morning sputum or morning sputum quantitative culture of patients with clear pathogenic bacteria in hospital and outside the pneumonia. In addition to extra-nosocomial infection in a group of more than have underlying diseases. 87.2% of the hospital group of pathogenic bacteria for Gram-negative bacteria, Pseudomonas aeruginosa, Klebsiella-based. 75% of out-of-hospital group 1 without underlying diseases were Gram-positive bacteria, mainly Streptococcus pneumoniae and Staphylococcus aureus. Two groups of Gram-negative bacteria accounted for 75%, Pseudomonas aeruginosa, Acinetobacter, Klebsiella is the main pathogen. Inpatient group and outpatient group 2 had more compound infections than inpatient group 1, with severe bacterial resistance and poor prognosis.