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[Infectious external otitis: etiology in the Terrassa region, culture methods, and considerations on otomycosis]

M Bayó1, M Agut, M A Calvo

  • 1Laboratorio de análisis M. Bayó Boada, Terrassa.

Microbiologia (Madrid, Spain)
|September 1, 1994
PubMed

Insights

This study investigated outer ear infections in Terrassa, identifying Pseudomonas aeruginosa as the most common cause. Otomycosis, often caused by Aspergillus niger, was also a significant finding.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Otolaryngology

Background:

  • Outer ear infections, or otitis externa, are common and can be caused by various microorganisms.
  • Understanding the specific etiological agents in a particular geographic region is crucial for effective treatment.

Purpose of the Study:

  • To determine the microbial etiology of outer ear infections in the Terrassa region of Barcelona.
  • To identify the most prevalent microorganisms responsible for otitis externa and otomycosis.

Main Methods:

  • Analysis of 1419 ear discharge samples collected over a six-year period (1987-1992).
  • Isolation and identification of microorganisms using traditional culture media and a novel modified medium (APA).

Main Results:

  • Pseudomonas aeruginosa was the most frequently isolated microorganism.
  • 76.5% of infections were unimicrobial.
  • Fungal elements (moulds or yeast) were present in 6.9% of samples, with Otomycosis accounting for 5.9% of cases.
  • Aspergillus niger was identified as the primary agent of otomycosis.

Conclusions:

  • Pseudomonas aeruginosa is a dominant pathogen in outer ear infections in the studied area.
  • Fungal infections, particularly otomycosis caused by Aspergillus niger, represent a significant proportion of outer ear pathologies.

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