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A case of feline otitis externa due to Microsporum canis
J Guedeja-Marron1, J L Blanco, M E Garcia
1Departamento Patología Animal I, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
Abstract:
We describe a case of a 3-month-old Persian male cat with a persistent waxy, ceruminous, otic discharge in both external auditory canals. After microbiological culture, only Microsporum canis was isolated with no concurrent fungal or bacterial flora. Fungal otitis due to dermatophytes was diagnosed and specific treatment with griseofulvin was administered. After 4 weeks of treatment, no M. canis colonies were isolated and clinical recovery had occurred. In view of this case, dermatophytosis should be included in the differential diagnosis of feline otic conditions, particularly when otitis becomes chronic or is refractory to treatment.
Insights
Fungal otitis caused by Microsporum canis was diagnosed in a cat. Treatment with griseofulvin led to clinical recovery, suggesting dermatophytosis as a cause of chronic feline otitis.
Area of Science:
- Veterinary Medicine
- Mycology
- Feline Health
Background:
- Otitis externa is common in cats.
- Chronic or refractory otitis often requires broad differential diagnoses.
- Dermatophyte infections are typically associated with skin and hair coat, not typically the ear canal.
Observation:
- A 3-month-old Persian cat presented with persistent waxy discharge from both ear canals.
- Microbiological culture of the ear discharge yielded only Microsporum canis.
- No concurrent bacterial or fungal pathogens were identified.
Findings:
- Fungal otitis externa due to dermatophytosis was diagnosed.
- Treatment with griseofulvin resulted in the eradication of Microsporum canis.
- Complete clinical recovery was achieved after four weeks of therapy.
Implications:
- Dermatophytosis should be considered in the differential diagnosis of feline otitis externa.
- This is particularly relevant for cases of chronic or treatment-refractory otitis.
- Early diagnosis and targeted antifungal therapy can lead to successful outcomes.