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35 Cards in this Set
- Front
- Back
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Examples of Superficial Mycoses |
- Pityriasis versicolor - Black piedra - White piedra - Tinea nigra |
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Causative agent of Pityriasis versicolor / Tinea versicolor |
Malassezia furfur |
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Causative agent of Black piedra |
Piedraia hortae |
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Causative agent of White piedra |
Trychosporon beigelii |
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Caisative agent of Tinea nigra |
Hortaea werneckii |
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Color of the Lessions infected by Malassezia furfur in Fluorescence using Wood's Lamp |
Pale Yellow / Bright Gold |
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- Chronic, Mild, Asymptomatic infection of the Stratum corneum - Scaly patches / furfuraceous macules on arms, upper back, chest, trunk, abdomen, neck, or face |
Pityriasis versicolor / Tinea versicolor |
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Factors responsible for the overgrowth of Malassezia furfur: |
1) Px receiving high dose lipid replacement therapy 2) Corticosteroid therapy 3) Genetic influence 4) Poor hygiene 5) Excessive sweating |
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Distribution of Malassezia furfur |
Worldwide: increase prevalence (hot, humid, tropical) |
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- Another form of Pityriasis versicolor - Follicular papules and pustules on back, chest, and upper arms; sometimes the neck and face |
Pityriasis folliculitis |
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Dandruff caused by Malassezia furfur |
Seborrhoeic dermatitis |
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Colonial Characteristics of Malassezia furfur |
- Lipophilic - Smooth, cream-colored, moist, yeast-like colony - Fast grower (2 -5 days at 30°C) |
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Microscopic Appearance of Malassezia furfur |
- Branched - septate hyphae w/ oval yeast cells (4 - 8 μm) - Spaghetti and Meatball appearance |
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Lab test for Malassezia furfur |
Wood's Lamp: - Skin scrapping - Yellow to Green fluorescence - 10 - 20% KOH (to see spaghetti and meatball appearance) |
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Treatment for Malassezia furfur |
- 3% Salicylic acid, 5% Benzoyl peroxide - 10 - 20% aq. Sol. of Sodium hyposulfite - 20 - 30% Sodium thiosulfate |
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- Firm, hard, dark brown to black irregular nodules along the scalp and hair shaft - Latin America, Africa, Asia, Tropical areas |
Black piedra |
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Colonial Characteristics of Piedraia hortae |
- Slightly fussy, Dark brown, w/ Metallic green tinge - Slow grower (2 - 4 weeks) |
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Microscopic Appearance of Piedraia hortae |
- Septate hyphae - Oval asci w/ fusiform ascospores |
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Treatment for Piedraia hortae |
- Cutting or shaving of hair - Benzoic and Salicylic acid - 3% Sulfur ointment |
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White to tan, soft, nodules on beard, moustache, and genital area |
White piedra |
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Trichosporon spp are found in: |
- Normal flora of the skin - Opportunistic systemic pathogen- Immunocompromised host - Px w/ undergoing chemo - People w/ hematologic disorder or malignancies |
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Trichosporon spp. that is extremely pathogenic to human |
Trichosporon beigelii |
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Trichosporon spp. that can cause systemic disease (meningitis) |
Trichosporon mucoides |
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Trichosporon spp. that can cause diseases to immunocompromised px. |
Trichosporon Asahaii |
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Tissues / organs that are affected by Trichosporon spp. |
- Blood - CSF, and other organs |
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Distribution of Trichosporon |
Worldwide: - Endemic tropical areas of South America - Far East and the Pacific |
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Colonial Characteristics of Trichosporon beigelii |
- White to tan, Smooth, to slightly wrinkled colony - Moderate Grower (1 - 2 weeks) |
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Microscopic Appearance of Trichosporon beigelii |
Septate hyphae w/ Oval Arthroconidia and Blastoconidia |
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Lab Test for Trichosporon beigelii |
- Infected hair / shaft w/ 10 - 20% KOH
Biochemical test (confirmatory) - Absence of Carbohydrate fermentation - Utilization of K nitrite - Assimilation of sugars - Urease (+) |
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Treatment for Trichosporon beigelii |
*same w/ black piedra - Cutting or shaving of hair - Benzoic and Salicylic acid - 3% Sulfur ointment |
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Tinea nigra is also known as |
- Pityriasis nigra - Microsporis nigra - Keratomycosis nigricans palmaris |
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Dark brown to black mascules (Flat, non-scaly, sharply marginated) |
Tinea nigra |
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Causative agents of Nigra palmaris |
- Exophiala werneckii - Hortaea werneckii - Pheoannellomyces werneckii - Cladosporium werneckii |
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Hortaea werneckii is commonly isolated where? |
- Soil - high risk: Agriculture workers |
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Distribution of Taenia nigra |
- Tropical areas of Central and South America - Africa - Asia |
