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Published on: July 1, 2018
Enterococcal meningitis: report of four cases and review
K B Stevenson1, E W Murray, F A Sarubbi
1Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City 37614-0622.
Abstract:
Enterococci, a significant cause of human infections outside of the CNS, have only rarely been documented to cause meningitis. To add to our understanding of this uncommon infectious process, we report our experience with four patients with enterococcal meningitis and summarize findings associated with 28 additional cases found in the medical literature. The majority of the adult patients with this condition had coexistent chronic underlying illnesses and were frequently exposed to immunosuppressive therapy. In addition, more than one-third of these patients had experienced CNS trauma or surgery, and 31% had an infection with enterococci at a site other than the CNS. Pediatric patients predominantly had underlying CNS pathology primarily consisting of neural tube defects or hydrocephalus. Primary meningitis occurred in 25% of pediatric patients, with most of these episodes occurring in neonates. Most patients presented with expected signs, symptoms, and physical features of acute bacterial meningitis and had typical CSF abnormalities, including leukocytic pleocytosis, elevated protein levels, and hypoglycorrhachia. The overall mortality rate among patients with enterococcal meningitis was 13%. The small number of patients in this review failed to demonstrate a definite difference in mortality among patients treated with cell wall-active agents alone vs. those treated with combination therapy with an aminoglycoside, although studies of patients with other complicated enterococcal infections suggest that combination therapy would be preferable.
Insights
Enterococcal meningitis is rare but serious, often affecting adults with underlying conditions and children with CNS issues. While mortality is 13%, optimal treatment strategies require further investigation.
Area of Science:
- Infectious Diseases
- Neurology
- Microbiology
Background:
- Enterococci are common causes of non-CNS infections but rarely cause meningitis.
- Understanding enterococcal meningitis is crucial due to its uncommon but significant nature.
Observation:
- This study reviewed 32 cases of enterococcal meningitis, including 4 new cases and 28 from literature.
- Adult patients often had comorbidities, immunosuppression, CNS trauma/surgery, or extra-CNS enterococcal infections.
- Pediatric cases frequently involved underlying CNS abnormalities like neural tube defects or hydrocephalus.
Findings:
- Clinical presentation and cerebrospinal fluid (CSF) findings were typical of acute bacterial meningitis.
- The overall mortality rate for enterococcal meningitis was 13%.
- No definitive difference in mortality was observed between monotherapy and combination therapy in this small cohort.
Implications:
- Enterococcal meningitis requires prompt recognition and management, especially in at-risk populations.
- Further research is needed to establish optimal therapeutic regimens, potentially favoring combination therapy with aminoglycosides.
- This study contributes to the understanding of a rare but potentially severe infectious disease.
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