(三)医院性肺部感染1974年7月到12月对医院性下呼吸道感染的某次调查结果显示:内、外科发生率约为7.5/1,000,妇儿科约为1.5/1,000。估计1974年美国住院病人总数为35,500,000,可以推测医院性下呼吸道感染多达175,000余例.分离所得的细菌中,60%属革兰氏阴性菌(肠杆菌科占45%),而金黄色葡萄球菌仅占11%. 对一组200例住院期间死亡病例进行分析,发 (C) Hospital-based lung infections A survey of hospital-acquired lower respiratory tract infections in July-December 1974 showed that the incidence of internal and surgical incidents was approximately 7.5 / 1,000 and that of women and children was approximately 1.5 / 1,000. It is estimated that the total number of inpatients in the United States in 1974 was 35,500,000, accounting for as many as 175,000 cases of hospital-acquired lower respiratory tract infections.60% of the isolated bacteria were Gram-negative (Enterobacteriaceae 45%), while golden yellow Cocci accounted for only 11% of a group of 200 hospitalized deaths were analyzed and sent