革兰氏阴性杆菌脑膜炎可分为三种不同的类型:新生儿脑膜炎,中枢神经系统损伤或手术后继发性脑膜炎和成人特发性脑膜炎。革兰氏阴性杆菌虽为新生儿脑膜炎的常见病原菌,但在成人脑膜炎则并不多见。作者报告1968～1978年间四个医院收治的30例革兰氏阴性杆菌成人脑膜炎,分为神经外科手术后和特发性脑膜炎两组。从发病、临床表现和预后等方面分析两者的相似处与不同点,并特别注意阐明受威胁人群、病 Gram-negative bacilli meningitis can be divided into three different types: neonatal meningitis, central nervous system injury or post-operative secondary meningitis and adult idiopathic meningitis. Gram-negative bacilli are common pathogens of neonatal meningitis, but rare in adult meningitis. The authors reported 30 Gram-negative bacilli adult meningitis in four hospitals from 1968 to 1978. They were divided into two groups: neurosurgery and idiopathic meningitis. From the incidence, clinical manifestations and prognosis aspects of the similarities and differences between the two, with particular attention to clarify the threatened population, the disease