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43 Cards in this Set
- Front
- Back
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Aspergillus flavus - macroscopic view |
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Malasezzia furfur |
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Aspergillus flavus - microscopically |
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Curvularia lunata - macro |
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Curvularia |
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Tinea versicolor - the condition caused by Malassezia furfur - organism |
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Causes tinea versicolor. Skin scrapings reveal spaghetti and meatballs appearance. Fluoresces under Woods light. Culture and ID not routinely done |
Malassezia furfur - organism |
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Malassezia furfur |
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Tinea versicolor - condition caused by Malassezia furfur - organism |
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Causes tinea nigra - normally asymptomatic. It is a dimorphic fungus. Microscopic skin scrapings show darkly pigmented yeastlike cells and hyphal elements Culture and ID with Sabouraud's dextrose agar grows pigmented yeast and fungal hyphae seen microscopically |
Exophiala Werneckii - organism |
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Exophiala Werneckii - organism |
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Tinea nigra - condition caused by Exophiala Werneckii - organism |
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Tinea nigra - condition caused by Exophiala Werneckii - organism |
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Causes black piedra. Colonizes the hair shaft. Detected by micro exam of hair showing a hard black nodule surrounding the hair shaft.
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Piedraia hortae - organism |
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Piedraia hortae - organism |
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Black piedra - condition caused by Pedraia hortae - organism Masses of fruiting bodies of ascospores on human hair |
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Causes white piedra, which colonizes around the hair shaft (white and creamy) Detected on micro exam of hairs showing a cream-colored soft, pasty growth surrounding the hair shaft Culture and ID by Sabouraud's dextrose agar presenting as a dimorphic fungus - septate hyphae, arthroconidia, and blastoconidia |
Trichosporon beigelii - organism |
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Trichosporon beigelii - organism |
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White piedra - condition caused by Trichosporon beigelii - organism |
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what are fungal infections called? |
Mycoses |
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fungi are eukaryotic, lack chlorophyll and absorb all nutrients from the environment, and cell walls are made of chitin |
general characteristics of fungi |
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Fuzzy, fluffy, cottony, wooly, filamentous |
Hyphae (molds) |
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Moist, creamy, wet, pasty cololnies |
Yeasts |
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pathogenic fungi which can be both - "the bad boys" Grow as yeast at body temp and molds at room temp |
Dimorphic fungi |
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Unicellular - 2-60 micrometers Reproduce by budding. If no septum formed, elongated bud called a pseudohypha (germ tube) is formed - this is the branching seen Resemble bacterial colonies on agar |
Yeasts |
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grow by tubelike projections - true hyphae, which intertwine to form a cottony matt called mycelium. vegetative hyphae reaches into the agar for nutrients aerial hyphae reaches into the air for nutrients |
Molds |
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aerial hyphae have specialized reproductive structures from which what occurs? |
sexual spores or asexual conidia occurs |
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No cross walls Exampleis Phylum zygomycota |
Aseptate hyphae |
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Most fungi have hyphae that occur this way |
Septate hyphae |
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Individual oval to round cells which bud to form daughter cells |
Yeasts |
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Fungi that exist as either yeast or mold. At room temp they grow as molds, at body temp they grow as yeast. Most are pathogenic |
Dimorphs |
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Sabouraud's agar Dermatophyte agar Mycosel BHI |
Primarily fungal culture media |
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Growth rate, colonial morphologic features, and microscopic morphological features are used to |
ID molds |
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tease mount cellophane tape mount slide culture |
Methods of microscopic examination of molds |
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fundamental microscopic units, tube-like projections |
hyphae |
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asexual spores produced by specialized vegetative hyphae called conidiophores. May be macro or micro |
conidia |
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flask or vase shaped extension from hyphae that may support conidia |
phialides |
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fragmentation of the mycelium at the septum into cylinder or cask-shaped thick-walled spores |
arthroconidia |
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thick-walled asexual spores formed by "rounding up" and enlargement of the terminal hyphal cells |
chlamydospores |
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These colonize skin, hair, and nails. They produce keratinase, which hydrolyzes keratin |
dermatophytes |
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these become filamentous when they invade tissues |
Candida |
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Dimorphic, forming yeasts in the human body |
Systemic mycoses |
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What organism produces a capsule which protects it from the immune system? |
Cryptococcus neoformans |