06-Superficial Fungi I Flashcards
1
Q
- Above what level of the hair shaft do dermatophytes infect?
A
- Adamson’s fringe
2
Q
- Do candida infections occur in high or low pH? What factors affect the pH conducive to candiasis?
A
- High pH; panty-liners, diapers, occlusive agents
3
Q
- What is the most reliable test to distinguish T. rubrum from T. mentag?
A
- Hair perforation test
4
Q
- Which dermatophyte is most commonly responsible for tinea gladiatorum?
A
- T. tonsurans
5
Q
- What is the causative non-dermatophyte in resistant T. Pedis?
A
- Scytalidium dimidiatum – resistant to most antifungals but sensitive to cycloheximide
6
Q
- What organism most commonly causes favus?
A
- T.schoenleilli
7
Q
- Define mycelium.
A
- A mass of hyphae
8
Q
- What are chlamydoconidia? What organism produces chlamydoconidia?
A
- Thick-walled round cells resistant to the environment. T. tonsurans
9
Q
- What is the most common cause of white superficial onychomycosis?
A
- T. mentographytes
10
Q
- What accounts for the depigmentation seen in tinea versicolor?
A
- Dicarboxylic acid
11
Q
- What is the organism responsible for tinea nigra?
A
- Horteae/ Exophiala wernickii
12
Q
- What causes black piedra? What is the clinical presentation?
A
- Piedra hortae; brown/black firmly adherent nodules on hair
13
Q
- Malassezia has been implicated in what neonatal skin condition?
A
- Neonatal cephalic pustulosis
14
Q
- Name 4 geophilic organisms. What kind of inflammatory response do they elicit in humans?
A
- M. gypseum (tinea corporis, capitis), T. terrestre, M. fulvum, M. cookie; modsevere inflammation
15
Q
- Name zoophilic organisms. What kind of inflammatory response do they elicit in humans?
A
- M. canis, T. Mentagrophytes, M. gallinae, T. equinum, T. verrucosum, M. nanum, T. simii, M. persicolor; intense inflammation