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18 Cards in this Set
- Front
- Back
What is Mayer's mucicarmine stain used for?
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Highlight capsule (mucopolysaccharide) of Cryptococcus.
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What is Gomori's methenamine silver used for?
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standard stain for all fungal species; fungi stain black
limitation: small yeast aren't seen well b/c you can't differentiate them from nuclear debris |
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What stains fungi magenta?
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Periodic acid Schiff with diastase.
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What are three genera of dermatophytic infections?
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1. Epidermophyton
2. Microsporum 3. Trichophyton |
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What is the most common etiologic agent of tinea capitis?
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Trichophyton tonsurans
Produces black dot ringworm |
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What is the second most common cause of tinea capitis?
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Microsporum canis
also causes Tinea Corporis in children (get it from pets) |
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What causes the epidemic form of tinea capitis?
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Microsporum audouinii
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What is the most common fungal infection of man?
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Tinea Pedis
most commonly by Trichophyton rubrum |
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What is Tinea Imbricata and where does it occur?
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Form of Tinea Corporis
Occurs in Pacific, SE Asia, Central and S. America Caused by Trichophyton concentricum |
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What is the most common cause of Tinea Corporis, Cruris, and Pedis?
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Trichophyton rubrum
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A patient has proximal subungual onychomycosis. What should you be suspicious of?
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HIV or immunocompromised state.
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What is the most common presentation of onychomycosis?
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Distal Subungual
T. rubrum or mentagrophytes |
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What species is Malassezia furfur synonymous with?
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Pityrsporum orbiculare
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What is the usual mechanism by which localized cutaneous fungal infections occur?
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Most agents are soil saprophytes and are introduced via traumatic innoculation.
Think peat moss, thorns, wood, decaying vegetation |
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What is the infectious agent responsible for Sporotrichosis?
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Sporothrix schenkii
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What are the three infections caused by dematiaceous fungi?
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Eumycotic Mycetoma (aka Madura foot or Maduramycosis)
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What is a dematiaceous fungi?
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Produces melanin in its cell wall
Fall within category of subcutaneous fungal infections |
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What is the only cutaneous fungal infection caused by an algae?
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Protothecosis
think aquariums |