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Updated: May 5, 2026

Listeria monocytogenes Infection of the Brain
Published on: October 2, 2018
Listeria monocytogenes meningitis in an immunocompetent 18-year-old patient as a possible diagnostic and
Miodrag Vrbić1, Marina Dinić, Maja Jovanović
1Clinic for Infectious Diseases, Clinical Centre Nis, Nis, Serbia. mvrbic@open.telekom.rs
Introduction:
Listeria monoytogenes is the third most frequent cause of bacterial meningitis in adults. It commonly affects persons with defective cell-mediated immunity or advanced age, and only a few patiens with no underlying predisposition have been reported.
Case Report:
We presented an previously healthy, 18-year-old man with typical clinical features of meningitis. On the account of earlier treatment with ceftriaxone and cerebrospinal fluid finding, an assumption of partially treated bacterial meningitis was made. The initial treatment with vancomycin and ceftriaxone, substituted on day 4 with meropenem, did not produce any clinical effect. On day 6 Listeria monocytogenes was isolated and, even as late as that, the administration of ampicillin was followed by complete recovery of the patient.
Conclusion:
In younger, immunocompetent individuals, in spite of the existent diagnostic and therapeutic problems, the subacute course of Listeria monocytogenes meningitis provides enough time for appropriate treatment and favorable disease outcome.
Insights
Listeria monocytogenes meningitis can affect young, healthy individuals. Early diagnosis and ampicillin treatment led to a full recovery in an 18-year-old patient, highlighting effective therapeutic strategies.
Area of Science:
- Infectious Diseases
- Neurology
- Microbiology
Background:
- Listeria monocytogenes is a significant cause of bacterial meningitis, primarily affecting immunocompromised adults and the elderly.
- Cases in immunocompetent individuals are rare, posing diagnostic challenges.
Observation:
- An 18-year-old previously healthy male presented with meningitis symptoms.
- Initial broad-spectrum antibiotics (ceftriaxone, vancomycin, meropenem) were ineffective.
- Listeria monocytogenes was identified on day 6 of hospitalization.
Findings:
- Despite delayed identification and initial treatment failures, ampicillin administration resulted in complete patient recovery.
- The subacute progression of the meningitis allowed for timely diagnosis and effective intervention.
Implications:
- This case underscores the importance of considering Listeria monocytogenes in meningitis, even in young, immunocompetent patients.
- Prompt and appropriate antibiotic therapy, such as ampicillin, is crucial for favorable outcomes.
- The findings suggest that the course of Listeria meningitis may offer a window for effective treatment in younger populations.
Related Concept Videos
Bacterial Meningitis I: Introduction
Viral Meningitis
Bacterial Meningitis II: Pathophysiology
Encephalitis l: Introduction
Atypical Pneumonia
Brain Abscess l: Introduction

