Feline Dermatophytosis Study Guide
Overview and Clinical Importance
Dermatophytosis (commonly known as ringworm) is a superficial fungal infection of keratinized structures including skin, hair, and nails in cats. Despite its common name, this condition is not caused by a worm but by fungi called dermatophytes. This is a high-yield NAVLE topic due to its clinical prevalence, zoonotic potential, and importance in shelter medicine.
Microsporum canis is the causative agent in greater than 90% of feline dermatophytosis cases. The disease is self-limiting in immunocompetent cats (typically resolving within 4 months) but treatment is always recommended to shorten clinical course, reduce environmental contamination, and prevent zoonotic transmission.
Etiology and Pathogenesis
Causative Organisms
Dermatophytes are keratinophilic fungi that utilize keratin as a nutrient source. They are classified by their natural reservoir:
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