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Efficacy of meropenem in experimental meningitis

K Nairn1, G L Shepherd, J R Edwards

  • 1Infection Research Department, Zeneca Pharmaceuticals, Macclesfield, Cheshire, UK.

The Journal of Antimicrobial Chemotherapy
|July 1, 1995
PubMed

Insights

Meropenem demonstrated effectiveness in a guinea-pig meningitis model, showing significant activity against various bacterial pathogens, including difficult-to-treat strains.

Area of Science:

  • Infectious Diseases
  • Pharmacology
  • Microbiology

Background:

  • Bacterial meningitis remains a critical global health challenge, necessitating effective antibiotic treatments.
  • The emergence of antibiotic resistance, particularly in Streptococcus pneumoniae, complicates treatment strategies.
  • Evaluating novel antibiotics like meropenem in relevant animal models is crucial for understanding their therapeutic potential.

Purpose of the Study:

  • To assess the efficacy of meropenem against a spectrum of bacterial pathogens causing meningitis in a guinea-pig model.
  • To compare the activity of meropenem with established comparator antibiotics in this infection model.
  • To investigate meropenem's penetration into cerebrospinal fluid (CSF) and its impact on bacterial load.

Main Methods:

  • A guinea-pig model of acute bacterial meningitis was established using various pathogens.
  • Animals were treated with meropenem or comparator antibiotics (ceftriaxone, ceftazidime, benzyl penicillin, ampicillin/gentamicin).
  • Efficacy was determined by monitoring white blood cell counts, protein concentrations, and bacterial loads (CFU/mL) in CSF.

Main Results:

  • Meropenem exhibited significant antibacterial activity against Haemophilus influenzae, Neisseria meningitidis, Streptococcus pneumoniae (including penicillin-resistant strains), Escherichia coli, Pseudomonas aeruginosa, and Listeria monocytogenes.
  • Meropenem was as active as, and often more active than, comparator agents.
  • Notably, meropenem showed superior efficacy against penicillin-resistant S. pneumoniae compared to ceftriaxone and against P. aeruginosa at low doses compared to ceftazidime.

Conclusions:

  • Meropenem demonstrated broad-spectrum efficacy in a preclinical model of bacterial meningitis.
  • Its activity against challenging pathogens, including antibiotic-resistant strains, highlights its therapeutic promise.
  • Sufficient CSF penetration allows meropenem to effectively reduce bacterial loads, supporting its potential clinical utility.

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