[Community-acquired meningitis due to methicillin susceptible Staphylococcus aureus]

P Pinet1, E Denes, F Garnier

  • 1Service de maladies infectieuses et tropicales, CHU Dupuytren, avenue Martin-Luther-King, Limoges, France. pauline.pinet@noos.fr

Abstract

Insights

Community-acquired meningitis caused by methicillin-susceptible Staphylococcus aureus (MSSA) is rare but severe. This infection often spreads to other tissues, requiring prolonged antibiotic treatment for a good outcome.

Area of Science:

  • Infectious Diseases
  • Neurology
  • Microbiology

Context:

  • Meningitis caused by Staphylococcus aureus is uncommon.
  • Methicillin-resistant Staphylococcus aureus (MRSA) is typically associated with neurosurgery, while methicillin-susceptible Staphylococcus aureus (MSSA) can cause community-acquired meningitis.
  • Community-acquired MSSA meningitis is underreported despite its severity.

Purpose:

  • To describe the characteristics of community-acquired meningitis due to MSSA.
  • To analyze patient demographics, clinical presentation, laboratory findings, and treatment outcomes.

Summary:

  • Five patients with community-acquired MSSA meningitis were studied over 18 months.
  • Patients presented with extraneurological infections (bone, lung) and bacteremia; neurological signs were infrequent at onset.
  • Cerebrospinal fluid analysis showed characteristic inflammatory markers. All patients recovered with prolonged antibiotic therapy.
  • The presence of TSST-1 in some strains may contribute to disease severity.

Impact:

  • Highlights community-acquired MSSA meningitis as a serious infection.
  • Emphasizes the need for prompt diagnosis and aggressive treatment, including addressing extraneurological foci.
  • Suggests further investigation into the role of TSST-1 in MSSA meningitis pathogenesis.

Related Concept Videos

Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
Bacterial Meningitis01:24

Bacterial Meningitis

Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...