| 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 |
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