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Microbial aetiology of otitis externa.

W L Dibb1

  • 1Department of Microbiology, Central Hospital, Fredrikstad, Norway.

The Journal of Infection
|May 1, 1991
PubMed
Summary

This study investigated ear infections in otitis externa patients, identifying common bacteria like Staphylococcus aureus and Pseudomonas aeruginosa. Gram-positive bacteria were more prevalent in this region than previously reported.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Otology

Background:

  • Otitis externa is a common ear infection.
  • Microbial etiology varies geographically.
  • Understanding local pathogens is crucial for effective treatment.

Purpose of the Study:

  • To identify the common bacterial and fungal isolates in patients with otitis externa.
  • To compare the prevalence of specific microorganisms with previous studies.
  • To investigate potential differences in microbial etiology between genders.

Main Methods:

  • Prospective collection of microbiological samples from ear swabs of otitis externa patients over one year.
  • Isolation and identification of bacteria and fungi using standard microbiological techniques.
  • Analysis of demographic data and correlation with microbial findings.

Main Results:

  • 226 evaluable samples were analyzed from 104 males and 122 females.
  • Common isolates included Staphylococcus aureus (34.1%), Pseudomonas aeruginosa (22.1%), and Streptococcus pyogenes (8.8%).
  • Fungal isolates were found in 9.3% of samples; 15% showed mixed Gram-positive and Gram-negative bacteria.
  • Gram-negative infections were more common in males, while females had more cases with no clear microbial cause.
  • Otitis externa involving Gram-positive bacteria appeared more prevalent locally compared to other studies.

Conclusions:

  • Staphylococcus aureus and Pseudomonas aeruginosa are significant pathogens in otitis externa in this region.
  • The prevalence of Gram-positive bacteria in otitis externa may be higher in this area than in others.
  • Further research into gender-specific microbial patterns and treatment outcomes is warranted.

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