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16 Cards in this Set
- Front
- Back
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What etiologic agents cause Cutaneous mycoses?
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Dermatocytes: Candida, Scopulariopsis brevicaulis, Scytalidium
Dermatophytoses: Microsporum, Epidermophyton, Trichophyton |
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what fungi cause onychomycosis (nail infection)?
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Candida, Scopulariopsis brevicaulis, Scytalidium
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what infectious disease does Microsporm cause?
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Tinea capitis
has numerous rough, thick walled macrocondidia, few microcondidia |
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what diseases are caused by dermatophytes? (cutaneous mycoses)
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Tinea capitis (hair-bending head)
Tinea barbea (beard) Tinea corporis (glabrous skin devoid of hair) Tinea cruris (groin) Tinea unguium (nails) Tinea pedis (foot) Onychomycosis (chronic nail thickening discoloration, deformation) |
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What are the three dermatophytoses that cause cutaneous mycoses?
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Microsprorum
Epidermophyton Trichophyton |
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what is the source of the different Tinea infections?
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Keratinous tissue
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Are cutaneous dermatophytoses contagious?
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YES
contagious by direct contact or fomite (keratinous tissue) by virtue of hyphal or conidial transfer |
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what are the virulence factors of Microsporum, Epidermophyton, and Trichophyton?
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These are the etiological agents that cause dermatophytoses (Tinea infections/cutaneous)
Molds contain keratinase: break down layers of hair, skin, and nails Hyphae are able to infect the stratum corneum, hair follicles, and or hair shaft |
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Describe the clinical manifestation of Tineas?
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ringworms: inflammation which decreases towards the center
classified on the basis of anatomic involvement |
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what is an Anthropophilic infection?
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Caused by Dermatophytoses
Anthropophilic infections tend to be chronic, non-inflammatory, and difficult to treat |
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_______ and ________ mycoses are typically inflammatory and readily cured.
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Zoophilic and Geophilic mycoses are typically inflammatory and readily cured
this is a clinical manifestation of a dermatophytoses |
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How is a Microsporum infection morphologically identified?
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Numerous rough, thick walled, macroconidia and few microconidia
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How is a Epidermaphyton infection morphologically identified?
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clusters of smooth walled macrocondidia
NO microcondidia |
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How is a Trichophyton infection morphologically identified?
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few smooth, thin walled macroconidia
Numerous pleomorphic microconidia |
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You suspect your patient of having a Dermatophytoses, Tinea pedis. How do you determine what the etiological agent is? what will the culture characteristics be seen?
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Determine microscopic morphology
in vitro cultures of all genera yields filaments of hyaline septate hyphae, arthronconidia in chains, or dissociated arthroconidia would need to observe microscopically the macroconidia to differentiate |
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How do you treat a cutaneous mycoses?
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Dermatophytoses
topical chemotherapy is efficacious for localized skin infections Oral chemotherapy is required for infections involving hair and nails |
