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MT6322 MYCOVIRO > U3 LEC: SUPERFICIAL MYCOSES > Flashcards

U3 LEC: SUPERFICIAL MYCOSES Flashcards

1
Q

Infections confined to the outermost layer of skin or hair

A

Superficial Mycoses

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2
Q

Superficial mycoses are infections confined to the?

A

outermost layer of skin or hair

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3
Q

Skin infections

A

Tineas

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4
Q

Hair infections

A

Piedras

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5
Q

T/F: Superficial mycoses do not show overt symptoms.

A

True

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6
Q

Latin, meaning worm

A

Tinea

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7
Q

Clinical manifestation of Malassezia furfur

A

Tinea versicolor

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8
Q

Tinea versicolor is caused by?

A

Malassezia furfur

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9
Q

Tinea versicolor is also known as?

A

Pityriasis versicolor

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10
Q

Tinea versicolor

Lesions

A

Patchy lesions or scaling of varied pigmentation

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11
Q

Tinea versicolor

Thought to be cause of?

A

dandruff

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12
Q

T/F: Tinea versicolor affects all ages.

A

True

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13
Q

Tinea versicolor

May involve what areas?

A

any area but primarily:
- face
- chest
- trunk
- abdomen

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14
Q

Tinea versicolor

Patches in darkly pigmented skin

A

Pale patches

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15
Q

Tinea versicolor

Spots in fair skin

A

Fawn-colored liver spots

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16
Q

Tinea versicolor

Evident in?

A

warm months

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17
Q

Common endogenous skin colonizer

A

Malassezia furfur

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18
Q

M. furfur is ____philic

A

lipo

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19
Q

Appearance of M. furfur

A

spaghetti and meatballs

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20
Q

M. furfur

Epidemiology

A

worldwide, hot, humid and tropical locations

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21
Q

M. furfur

Risk factors

A
  • receiving corticosteroid therapy
  • genetic influence
  • poor nourishment
  • excessive sweating
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22
Q

M. furfur

Treatment

A
  • antidandruff shampoos
  • removal of indwelling feeding lines (lipid replacement therapy, infants)
  • selenium sulfide
  • topical or oral azoles
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23
Q

M. furfur

Daily applications of?

A

selenium sulfide

24
Q

Clinical manifestation of Hortaea werneckii

A

Tinea nigra

25
Q

Tinea nigra is caused by?

A

Hortaea werneckii

26
Q

Tinea nigra

Appearance

A

Brown to block non-scaly macules

27
Q

Tinea nigra

Occur most often on?

A

palms and soles

28
Q

T/F: Misdiagnosis in Tinea nigra
does not occur.

A

False

can occur

29
Q

Tinea nigra

Epidemiology

A

Tropical areas of
- Central and South America
- Africa
- Asia

30
Q

H. werneckii is formerly known as?

A
  • Phaeoannellomyces werneckii
  • Exophiala werneckii
31
Q

H. werneckii

Rate of growth in common fungal media

A

very slow

32
Q

H. werneckii is what kind of fungus?

A

Dematiaceous

33
Q

H. werneckii

Treatment

A
  • Keratolytic solutions
  • Salicylic acid
  • Azole antifungal drugs
34
Q

Clinical Manifestation of Piedraia hortae

A

Black piedra

35
Q

Black piedra is caused by?

A

Piedraia hortae

36
Q

Black piedra

Infection of the?

A

hairs of the scalp

37
Q

Black piedra

Appearance of nodules

A

Hard, dark brown to black

38
Q

Black piedra

The nodules are firmly attached to the?

A

hair shaft

39
Q

Black piedra

Epidemiology

A

Tropical areas:
- Africa
- Asia
- Latin america

40
Q

P. hortae

Treatment

A
  • Removal of infected hair
  • Topical antifungal agent
41
Q

Clinical manifestation of Trichosporon spp.

A

White Piedra

42
Q

White Piedra is caused by?

A

Trichosporon spp.

43
Q

White Piedra

Occurs on?

A

hair shaft

44
Q

White Piedra

Appearance of mycelia

A

Soft mycelial mat

45
Q

White Piedra

Soft mycelial mat surrounds?

A
  • hair of the scalp
  • face
  • pubic region
46
Q

White Piedra

Epidemiology

A

Tropical areas
- South America
- Africa
- parts of Asia

47
Q

No longer a valid species infecting humans

A

Trichosporon beigelii

48
Q

Implicated in most cases of superficial mycoses

A
  • T. ovoides
  • T. asteroids
  • T. cutaneum
  • T. inkin
49
Q

Severe and frequently fatal disease in immunocompromised hosts

A

T. asahii

50
Q

Causes meningitis

A

T. mucoides

51
Q

Occasionally found as part of normal skin biota

A

Trichosporon spp.

52
Q

Trichosporon spp.

Isolated from?

A

animals and soil

53
Q

Trichosporon spp.

Recognized as

A

opportunistic systemic pathogens

54
Q

Trichosporon spp.

under Opportunistic systemic pathogens

A
  • frequently fatal
  • occur in immunocompromised host
  • hematologic disorders or malignancies
  • undergoing chemotherapy
55
Q

Trichosporon spp.

Treatment

A
  • removal of infected hair
  • topical antifungal agent

MT6322 MYCOVIRO (10 decks)

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