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[Moraxella (Branhamella) catarrhalis. A common pathogenic agent]

J Prost1, M Scavizzi

  • 1Service de Bactériologie-Virologie, Hôpital Avicenne, Bobigny.

Presse Medicale (Paris, France : 1983)
|May 1, 1993
PubMed
Summary

Moraxella catarrhalis, a common bacteria, is a significant cause of infant ear infections and adult respiratory issues. Its pathogenic role is confirmed by antibody responses and specific bacterial counts in sputum.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Clinical Bacteriology

Background:

  • Moraxella catarrhalis is a commensal oropharyngeal organism.
  • Considered a potential pathogen since the 1970s.
  • Associated with otitis in infants and chronic bronchitis exacerbations in adults.

Purpose of the Study:

  • To review the pathogenic role of Moraxella catarrhalis.
  • To discuss diagnostic criteria for M. catarrhalis infections.
  • To outline current antibiotic treatment strategies.

Main Methods:

  • Review of clinical observations and microbiological data.
  • Analysis of sputum bacterial density thresholds.
  • Serological evidence of infection (specific serum antibodies).

Main Results:

  • M. catarrhalis infection is indicated by sputum density ≥10(7)/ml, 100-fold higher than other organisms.
  • Increased specific serum antibodies (total, IgG, IgA) confirm pathogenicity.
  • Sixty percent of strains produce beta-lactamase.

Conclusions:

  • Moraxella catarrhalis is a recognized pathogen in specific clinical settings.
  • Diagnosis relies on quantitative culture and serological markers.
  • Antibiotic choice must consider beta-lactamase production, favoring amoxicillin/clavulanic acid or cephalosporins.

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