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25 Cards in this Set
- Front
- Back
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Most common dermatophyte infections are with which organisms? |
Microsporum spp, trichophyton spp., and epidermophyton spp. |
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Blastoconidia are the beginning of which structures? |
Pseudohyphae |
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What are arthrospores? |
The result of a breaking off process of true hyphae resulting in square conidia. |
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What are the birdseed agar and urease reactions for C. neoformans? |
Urease pos, brown colonies on birdseed(Niger seed) agar. |
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What is the yeast enzme detected on birdseed agar? |
Phenol oxidase |
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What organism produces the enzyme phenol oxidase? |
C. neoformans |
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Both Trichosporon pullulans and Geotrichum spp. produce what? |
Arthrospores |
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Both T. pullulans and C. Neoformans are positive for what? |
Urease |
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How does C. tropicalis and C. pseudotropicalis differ? |
Arrangement of blastoconidia along pseudohyphae. |
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What are 2 common sp. recovered clinically from the zygomycetes group? |
Rhizopus and mucor spp. |
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Which dimorphic yeast shows a large parent yeast cell surrounded by smaller budding Yeats cells often referred to as the "mariner's wheel"? |
Paracoccidioides brasiliensis |
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How can you get infected by Histoplasma capsulatum? |
By inhaling spores from decaying bird or bat droppings. |
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The mycelial form of H. capsulatum resembles what other fungus? |
Sepedonium spp. |
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Name 5 pathogenic dimorphic fungi. |
Sporothrix schenckii, coccidioides immitis, blastomyces dermatitidis, Histoplasma capsulatum, paracoccidioides brasiliensis |
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Which dermatophyte does not produce microconidia? |
Epidermophyton spp. |
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Epidermophyton floccosum infects the skin but not the what? |
Hair |
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What 2 orgs cause epidemic tinea capitis in children? |
M. audouinii and T. tonsurans |
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Infected hair shafts cause by which fungi fluoresce yellow green under a wood's lamp? |
M. Audouinii and T. Tonsurans |
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Which trichophyton spp. invades the hair shaft? |
T. Mentagrophytes |
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Name a bunch of dematiaceous fungi. |
Alternaria, bipolaris, curvularia, exophilia, wangiella, madurella, scytalidium, phialophora, scedosporium |
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What is the name of the hyaline mold producing rose colored colonies with a lavender center on SAB and looks like a canoe? |
Fusarium spp. |
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In the US what is the most common fungus causing eumycotic mycetoma? |
Pseudallescheria boydii |
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What causes chromoblastomycosis? |
Fonsecaea pedrosoi |
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What organism produces cladosporium, phialophora, and fonsecaea types of sporulation? |
Fonsecaea pedrosoi |
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Which fungus sp does not produce rhizoids? |
Mucor sp. |
