从六十年代末到八十年代初,肺炎致病菌经历了肺炎球菌→金黄色葡萄球菌→革兰氏阴性杆菌的演变过程。目前,革兰氏阴性杆菌肺炎已占原发性肺炎的20％,占继发性(医院内获得)肺炎的40～60％。因本病预后恶劣,病死率高而日趋受到重视。现将我院1985年6月至1987年4月收治的19例革兰氏阴性(G下同)杆菌肺炎报告如下: 诊断标准 From the late 1960s to the early 1980s, pneumonia pathogens have undergone the evolution of pneumococci → Staphylococcus aureus → Gram-negative bacilli. Gram-negative bacilli pneumonia now accounts for 20% of primary pneumonia and 40-60% of secondary (hospital-acquired) pneumonia. Due to the poor prognosis of this disease, high mortality and more attention has been paid. Now in our hospital from June 1985 to April 1987 admitted 19 cases of Gram-negative (G the same below) bacilli pneumonia are reported as follows: diagnostic criteria