Dermatophytosis - Flashcards

DERMATOPHYTOSIS WIKIBUGS FLASHCARDS

Ringworm in a dog -Courtesy of Bristol BioMed Image Archive

Fungi

Question	Answer	Article
What are dermatophytes also known as?	Fungi Imperfecti Phaeohyphomycetes (Commonly called 'ringworm' in practice)	Link to Answer Article
Which two species of dermatophytes are of particular veterinary interest?	Microsporum Trichophton	Link to Answer 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	Link to Answer 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 Answer Article
How would you diagnose a dermatophyte infection?	Clinical sings 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 Answer 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 Answer Article