Dermatophytosis - Flashcards

Ringworm in a dog -Courtesy of Bristol BioMed Image Archive

Question	Answer		Article
What are dermatophytes also known as?	Fungi Imperfecti Phaeohyphomycetes (Commonly called 'ringworm' in practice)		Link to Article
Which two species of dermatophytes are of particular veterinary interest?	Microsporum Trichophton		Link to Article
Why are dermatophytes usually found in the subcutaneous and cutaneous tissue?	Lack of tolerance to body temperature and antifungal activity in serum and body fluids Are able to penetrate all layers of skin however Dermatophytosis		Link to Article
What clincial signs are usually present with a dermatophyte infection?	Epidermal hyperplasia and inflammation leading to peripheral red 'ringworm' Superficial perivascular dermatitis leading to intracorneal microabscesses Furunculosis Pustules in hair follicles cause by secondary invaders leading to alopecia		Link to Article
How would you diagnose a dermatophyte infection?	Clinical signs Wood's Lamp Examine in 10-20% KOH for the presence of hyphae or arthrospores with Lactophenol Cotton Blue to enhance visualisation Sabouraud's Dextrose agar containing cyclohexamide and chloramphenicol at room temperature for a month for culture Culture with Dermatophyte Test Medium (Saubouraud's Dextrose agar with phenol red indicator- medium changes from yellow to red if fungi present)		Link to Article
How are dermatophytes infections treated?	Isolation Griseofulvin Whitfield's ointment (Salicylic and benzoic acid) Aqueous lime sulphur topically for dogs Iodine Antibiotics Natamycin antifungal Imidiazole derivatives		Link to Article