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Superficial Mycoses

Mod 2 Lec 1

QuestionAnswer
Superficial Mycoses Cause: infections of non-living layer of skin and extrafollicular hair
Superficial Mycoses are diagnosed by: Appearance of lesion, skin scrapings, hair shafts
The 4 main superficial mycoses infections Tinea Versicolor, Tinea Nigra, White Piedra, Black Piedra
Tinea versicolor is caused by Malassezia furfur
What special addition is need to culture Malassezia furfur? Why? Oil overlay and incubate at 37C. Malassezia furfur is a lipophilic organism.
Malassezia furfur micro Thick walled hyphae and "yeast", some budding, has been called spaghetti and meatballs
Tinea Nigra is caused by Hortaea wernickii
Hortaea wernickii infects (tinea nigra) Keratinized skin layer of hand, most commonly younger than 25 and females
H. werneckii macro Grow slowly - mature w/in 21 days; pale, moist, shiny, yeast-like, turn velvety, olive-black w/thin layer of mycelium; reverse black; doesn't grow at 37C
H. werneckii micro Septate hypahe, yeast-like conidia, and chlamydospores; hyaline initially, become olive colored; annellides present intercalary and lateral; septate, thick-walled hyphae
Created by: blackicecreamcat