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Related Experiment Videos

Microbiology of otitis externa

W B Clark1, I Brook, D Bianki

  • 1Department of Pediatrics, Naval Hospital, Bethesda, Maryland, USA.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|January 1, 1997
PubMed
Summary

Otitis externa often involves multiple bacteria, with Pseudomonas aeruginosa and Staphylococcus aureus being common. Anaerobic bacteria play a role in a small percentage of these infections.

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Area of Science:

  • Otolaryngology
  • Infectious Diseases
  • Microbiology

Background:

  • Otitis externa is a common external ear infection.
  • Understanding the causative microorganisms is crucial for effective treatment.

Purpose of the Study:

  • To prospectively evaluate the microbiologic and clinical data of patients with otitis externa.
  • To identify the spectrum of aerobic and anaerobic bacteria involved in otitis externa.

Main Methods:

  • Prospective evaluation of 26 patients diagnosed with otitis externa.
  • Microbiologic processing of ear specimens for both aerobic and anaerobic bacteria.
  • Identification and quantification of bacterial isolates.

Main Results:

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  • Bacterial growth was observed in 23 out of 26 specimens (91%).
  • A total of 33 aerobic and 2 anaerobic bacteria were recovered.
  • Pseudomonas aeruginosa (14 isolates) and Staphylococcus aureus (7 isolates) were the most frequent aerobic bacteria.
  • Anaerobic bacteria were isolated in 8% of patients.
  • Polymicrobial infections were noted in approximately half of the patients.

    • Conclusions:

    • Otitis externa exhibits a polymicrobial etiology in a significant proportion of cases.
    • The study highlights the presence of both aerobic and anaerobic bacteria in otitis externa.
    • Further research is needed to explore the therapeutic implications of these microbial findings.