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Microbiology of otitis externa
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.
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:
- 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.