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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
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Moraxella catarrhalis as a respiratory pathogen.

Naveen Gupta1, Shamma Arora, Shailja Kundra

  • 1Zoonotic divison, National Center For Disease Control, Delhi, India. nicdnaveen@gmail.com

Indian Journal of Pathology & Microbiology
|January 12, 2012
PubMed
Summary
This summary is machine-generated.

Moraxella catarrhalis is an increasing respiratory pathogen, often resistant to multiple drugs. Susceptibility testing guides effective antibiotic treatment for lower respiratory tract infections (LRTI).

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Moraxella catarrhalis is an emerging respiratory pathogen.
  • Increasing isolation rates and multidrug-resistant strains necessitate appropriate antimicrobial strategies.
  • Effective treatment is crucial for eradication and preventing the spread of M. catarrhalis.

Purpose of the Study:

  • To assess the clinical significance and antimicrobial susceptibility patterns of Moraxella catarrhalis in lower respiratory tract infections (LRTI).
  • To provide data for guiding appropriate antibiotic therapy against M. catarrhalis.

Main Methods:

  • A 1-year study of patients with LRTI at P.G.I.M.S. Rohtak.
  • Isolation and identification of M. catarrhalis from respiratory specimens.
  • Antimicrobial susceptibility testing using standard microbiological methods.
  • Clinical significance assessment based on predefined criteria.

Main Results:

  • 63 clinically significant Moraxella catarrhalis isolates were identified.
  • High resistance rates were observed for cotrimoxazole (82.5%), penicillin (77.7%), and ampicillin (71.4%).
  • Maximum susceptibility was noted for cefotaxime (87.3%), tetracycline (85.7%), and ciprofloxacin (84.1%).
  • Multidrug resistance (to >3 antimicrobials) was present in 34.9% of isolates.

Conclusions:

  • Predominant M. catarrhalis growth in LRTI cases warrants reporting and treatment.
  • Antibiotic selection should be guided by susceptibility testing for optimal patient outcomes.
  • This data aids clinicians and microbiologists in managing M. catarrhalis infections effectively.