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Microbiology > Fungal Skin Infection > Flashcards

Fungal Skin Infection Flashcards

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Biology 101 flashcards
1
Q

Skin fungal infections types?

A

Superficial/Cutaneous/Subcutaneous

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2
Q

Superficial infection types?

A

tinea versicolor, piedra,

and tinea nigra;

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3
Q

Cutaneous infection types?

A

Dermatophytosis,

Candidiasis of skin ,mucosa, and nails and others

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4
Q

Subcutaneous infection types ?

A

mycetoma,
sporotrichosis,
chromoblastomycosis

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5
Q

? infections in which a pathogen is restricted to the
stratum corneum, with little or no tissue reaction or invasion.

A

Superficial Mycoses

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6
Q

affect the uppermost layers of skin or hair shaft. ?

A

Superficial Mycoses

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7
Q

painless and usually do not provoke the immune
system
?

A

Superficial Mycoses

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8
Q

long-term (chronic) fungal infection of the skin with ➢Patches of brown or discolored skin with sharp borders and fine scales.

?

A

Superficial Mycoses 1-Tinea Versicolor

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9
Q

The most common sites:
the back, underarms, upper arms, chest, and neck
Type?

A

Superficial Mycoses 1-Tinea Versicolor

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10
Q

Affected areas do not darken in the sun
There may be loss of skin color (hypopigmentation) or an increase in skin
color (hyperpigmentation).
Asymptomatic

Type?

A

Superficial Mycoses 1-Tinea Versicolor

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11
Q

Malassezia furfur

Etiology of?

A

Superficial Mycoses 1-Tinea Versicolor

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12
Q

a Yeast, Lipophilic Normal flora of skin

?

A

Malassezia furfur

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13
Q

Superficial Mycoses 1-Tinea Versicolor

Diagnosis ?

A
  1. Skin scraping using ( KOH)

2. Culture

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14
Q

Skin scraping of Tinea Versicolor how?

A

KOH

+ for short hyphae and thigh walled round , budding yeast-like cells ( spaghetti and meatballs )

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15
Q

Painless patches with brown or black color ➢ Usually located on palm of hand or sole of foot.
Type?

A

Superficial Mycoses

2-Tinea nigra

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16
Q

Etiology of?

Hortaea werneckii Dematiaceous filamentous fungus

A

Superficial Mycoses

2-Tinea nigra

17
Q

Laboratory Diagnosis of Superficial Mycoses
2-Tinea nigra
?

A
  • Skin scrapings

- Culture on SDA & Mycobiotic

18
Q

Asymptomatic infection of thr hair shaft, nodules on hair shaft on scalp hair/ mustache or beard
Type?

A

Superficial Mycoses

3-Piedra

19
Q

Dark pigmented nodules, hard and firm attached to hair shaft ? Etiology?

A

Black piedra / piedraia Hortae

20
Q

Lightly pigmented, white to brown nodules, soft , loosely attached ? Etiology ?

A

White piedra/ trichosporon biegelli ( yeast )

21
Q

trichosporon biegelli ( yeast) etiology of?

A

White piedra

22
Q

piedraia Hortae

Etiology of ?

A

Black piedra

23
Q

Superficial Mycoses
3-Piedra
Lab diagnosis ?

A

Hair with nodule

  • direct microscopy
  • culture : SDA and myobiotic agar
24
Q

Treatment of Superficial infections?

A
  • ketoconazole

- nizoral shampoo

25
Q

Fungal infections of the Keratinized tissues of the body ?

A

DERMATOPHYTOSES

26
Q

Scalp, glabrous skin, and nails caused by a closely related group of fungi
known as ?

A

Dermatophytoses

27
Q

Contagious?

A

Dermatophytoses

28
Q

Tinea or ring worms? + eg?

A

Dermatophytoses/ t capitis = scalp

29
Q

Microsporum

Etiology of? Infection of?

A

Dermatophytoses/ nails hair and skin

30
Q

Epidermophyton

A

Dermatophytoses/ nails hair and skin

31
Q

Trichophyton

A

Dermatophytoses/ nails hair and skin

32
Q

Presentations of?

Non-inflammatory ‘black dot’ type Pustular Inflammatory

A

Tinea Capitis

33
Q

Morphology of lesion Broken hairs, black dots, localized.

Diagnosis of?

A

Tinea Capitis

34
Q

Woods Lamp Blue green.
● Hair Shaft Exam Endo/Exothrix
● Culture
Diagnosis of ?

A

Tinea Capitis

35
Q

treat hair follicle
• Topical , but might be not effective • Systemic agents •Griseofulvin.
•Terbinafine.
•Treat until no visual evidence, culture (-)… plus 2 weeks?

A

Tinea Capitis Treatment

36
Q

Typically begins at distal nail corner Thickening and opacification of the nail plate Nail bed hyperkeratosis Onycholysis
?

A

Onychomycosis

37
Q

Often accompanying tinea pedis?

A

Onychomycosis

38
Q

Diagnostic Tests of Onychomycosis

A

➢
KOH Preparations
■ Skin ■ Nails ■ Hair

Fungal Cultures
Sabouraud dextrose Agar (SDA) DTM (Dermatophyte Test Medium)
Growth of fungi and color change from Yellow to
red is (+).

39
Q

Dermatophytoses Treatment?

A

B Topical or systemic ● Griseofulvin ● Terbinafine (Lamisil) ● Azoles
Miconazole (Daktrin), Clotrimazole (Canesten)
Systemic Itraconazole - others

Microbiology (6 decks)

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