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Updated: May 20, 2026

Listeria monocytogenes Infection of the Brain
Published on: October 2, 2018
Listeria monocytogenes meningitis in an immunocompetent adult: a case report
Yi Zhang1, Guo-Qing Zang, Zheng-Hao Tang
1Department of Infectious Diseases, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
Abstract:
Listeria monocytogenes (L. monocytogenes) is an uncommon cause of bacterial meningitis in immunocompetent adults. Patients with immunosuppression are at increased risk of developing serious invasive diseases, particularly meningitis. We describe a case of meningitis caused by L. monocytogenes in an immunocompetent and previously healthy 34-year-old adult. The patient received treatment with intravenous ampicillin plus amikacin and made a full recovery. L. monocytogenes should be suspected in immunocompetent adults with bacterial meningitis who fail to respond to empirical antibiotic treatment.
Insights
Listeria monocytogenes is a rare cause of meningitis in healthy adults. This case highlights the importance of considering this pathogen in immunocompetent individuals with bacterial meningitis unresponsive to standard treatment.
Area of Science:
- Infectious Diseases
- Neurology
- Microbiology
Background:
- Listeria monocytogenes (L. monocytogenes) is an uncommon pathogen causing bacterial meningitis, particularly in immunocompetent adults.
- Immunosuppression significantly increases the risk of invasive L. monocytogenes infections, including meningitis.
Observation:
- A case study of a previously healthy, immunocompetent 34-year-old adult diagnosed with L. monocytogenes meningitis is presented.
- The patient presented with symptoms indicative of bacterial meningitis.
Findings:
- The patient was successfully treated with intravenous ampicillin and amikacin.
- Full recovery was achieved following the specified antibiotic regimen.
Implications:
- Listeria monocytogenes should be considered in the differential diagnosis of bacterial meningitis in immunocompetent adults.
- Failure to respond to empirical antibiotic therapy warrants reevaluation and consideration of less common pathogens like L. monocytogenes.
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