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Mycology & Virology > Superficial Mycoses > Flashcards

Superficial Mycoses Flashcards

1
Q

Give the 2 superficial mycoses classifications

A
  1. Tineas (skin infection) 2. Piedras (hair infection)
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2
Q

superficial mycoses affects what layer of the skin?

A

stratum corneum (outermost layer)

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3
Q

Give the 2 types of tineas (skin infection)

A
  1. Tinea versicolor
  2. Tinea nigra
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4
Q

Give the 2 types of piedras (hair infection)

A
  1. Black piedre
  2. White piedra
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5
Q

Give 3 other names of tinea versicolor

A
  • Pityriasis versicolor
  • Tinea flava
  • Liver spot
  • Dermatomycosis furfuracea
  • Chromophytosis
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6
Q

Tinea versicolor’s causative agent

A

Malassezia furfur

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7
Q

grows on stratum corneum & resides lipophilic areas

A

Malassezia furfur

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8
Q

lesions are furfuraceous scales

  • *skin:** pale or fawn patches
  • *hair:** dandruff
A

Tinea versicolor

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9
Q

3 infection risks of tinea versicolor

A
  • genetic influence
  • poor nourishment
  • excessive sweating
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10
Q

Give 4 treatments for tinea versicolor

A
  • Whitfield’s ointment
  • 2.5% selenium sulfide lotion
  • Azole family
  • Vinegar
  • sodium thiosulfate
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11
Q

Tinea versicolor’s color in Wood’s lamp

A

golden yellow to light green fluorescence

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12
Q

Tinea versicolor’s KOH & PAS

A

KOH: round budding yeast cells

PAS: spaghetti and meatball apperance

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13
Q

3 oils used for Tinea versiclor’s SDA

A
  • Olive oil
  • Peanut oil
  • Vegetable oil
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14
Q

Tinea nigra palmaris causative agent

A

Hortaea werneckii

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15
Q

Give 2 other names for Hortaea werneckii

A
  • Exophiala werneckii
  • Cladosporium werneckii
  • Phaeoannellomyces werneckii
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16
Q

infection is usually in the palms or in the hands but can also be in the foot, sole, and wrist

A

Tinea nigra palmaris

17
Q
  • usually asymptomatic
  • Palms and soles are brown to black macules that are well defined irregular margin
A

Tinea nigra palmaris

18
Q

Give 4 treatments for Tinea nigra palmaris

A
  • Whitfield’s ointment
  • Salicylic acid
  • Tincture of iodine
  • Azoles
19
Q

Reagent used for Tinea nigra palmaris to reveal septate hyphal elements and budding cells

A

10-20% KOH

20
Q

Tinea nigra palmaris’ apperance on SDA with antibiotics at 37° C

A

olive to greenish black

21
Q

Tinea nigra palmaris’ microscopic examination

  • young cultures:
  • old cultures:
  • older hyphal colonies:
A
  • young cultures: budding blastoconidia (olive green)
  • old cultures: cluster of blastoconidia (greenish-black)
  • older hyphal colonies: annelloconidia (sawtooth appearance)
22
Q

Black piedra’s causative agent

A

Piedraia hortae

23
Q

Affected areas are scalp, eyebrows, eyelashes, and pubic hair

A

Black piedra

24
Q

3 treatments for Black piedra

A
  • 2% selenium sulfide
  • Castellani paint
  • Amphotericin B lotion
25
Black piedra in KOH resembles?
* multiseptated hypha with ascospores & chlamydospores * resembles arthrospores
26
**True or False** Black piedra is multiseptated hypha with ascospores and chlamydospores in KOH
True
27
Describe the culture of Black piedra
* compact * dark brown-black * conical colonies with short aerial hyphae
28
SDA temperature for Black piedra
25-30° C ## Footnote \*30 days +/ 7 days
29
White piedra causative agent
*Trichosporon beigelii*
30
soft mycelial mat affecting the hair of the scalp *(Microsporum bovidae)*, facial hairs, and pubic region *(Trichosporon inkin)*
White piedra
31
Give 3 treatments for White piedra
* shave or cut hair * ketoconazole * terbinafine * topical salicylic acid
32
hair looks soft, mucilaginous, white-yellowish soft nodules
White piedra
33
**KOH:** dark hyphae with asci \*blastospores & arthrospores adhering to the hair
White piedra
34
SDA has few vegetative hyphae
White piedra
35
**SDA:** smooth, highly-wrinkled or radially folded, yeastlike, cream-colored, with mycelial fringe
White piedra
36
**Microscopic:** presence of collarettes during conidiogenesis
Tinea versicolor
37
specimen of choice for tinea nigra palmaris
skin scrapings from darkly pigmented lesions
38
**True or False** The nodules of black piedra are directly attached to the hair shaft
False ## Footnote \*indirectly attached \*ectothrix

Mycology & Virology (4 decks)

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