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Acute Bacterial Meningitis in Adults, A Review of 493 Episodes NEJM 328:21-28, Durand,M.L.,et al, 1993 See this aricle in Pubmed Article Abstract During the 27-year period,445 adults were treated for 493 episodes of acute bacterial meningitis,of which 197(40 percent)were nosocomial.Gram- negative bacilli(other than Haemophilus influenzae)caused 33 percent of the nosocomial episodes but only 3 percent of the community-acquired episodes.In the 296 episodes of community-acquired meningitis,the most common pathogens were Streptococcus pneumoniae(37 percent).Neisseria meningitidis(13 percent)and Listeria monocytogenes(10 percent);these organisms accounted for only 8 percent of the nosocomial episodes.Only 19 of the 493 episodes of meningitis(4 percent)were due to H.influenzae.Nine percent of all patients had recurrent meningitis;many had a cerebrospinal fluid leak.Seizures occurred in 23 percent of patients with community- acquired meningitis,and 28 percent had focal central nervous system findings.Risk factors for death among those with single episodes of community-acquired meningitis included older age(>/=60 years),obtunded mental state on admission,and seizures within the first 24 hours.Among those with single episodes,the in-hospital mortality rate was 25 percent for community-acquired and 35 percent for nosocomial meningitis.The overall case fatality rate was 25 percent and did not vary significantly over the 27 years.Conclusions.In our large urban hospital,a major proportion of cases of acute bacterial meningitis in adults were nosocomial.Recurrent episodes of meningitis were frequent.The overall mortality rate remained high.

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