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Superficial Mycoses
Mod 2 Lec 1
Question | Answer |
---|---|
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 |