Organisms causing a gram negative meningitis include Pseudomonas aeruginosa, Escherichia coli, Enterobacter aerogenes, Proteus morganii, and Klebsiella pneumoniae. Risk factors include recent neurosurgery, and recent trauma or injury to the head . The infection is sometimes associated with cerebrospinal fluid shunt . In children, a local infection or urinary tract infection may be present. The incidence is 2 out of 100,000 people.
Treatment is with antibiotics with specific sensitivities to the causative organism.
The outcome depends upon the causative organism and underlying disease. This condition can be very serious and can need immediate treatment.