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Micro Quiz 4 Final > 27 Cutaneous and Subcutaneous Mycoses > Flashcards

27 Cutaneous and Subcutaneous Mycoses Flashcards

1
Q

Common fungal infections
Athletes foot
Ringworm of the scalp
Nail infection

A

.

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2
Q

What are Dermatophytoses?

A

Fungal skin infections

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3
Q

What are the genera that cause Dermatophytoses?

A

Epdermophyton
Trichophyton
Microsporum

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4
Q

What are the general properties of Dermatophytoses?

A

Filamentous fungi with septate hyphae that invade keratinized structures (skin, hair, nails)
Hyphae produce micro- and macro-conidia in lab

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5
Q

What are conidia?

wiki

A

are asexual, non-motile spores of a fungus and are named after the Greek word for dust, konia.

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6
Q

Which Dermatophytoses flouresces when exposed to UV light?

A

Microsporum

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7
Q

How do you name Dermatopytoses?

A

Tinea ____ body part.

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8
Q

What is Ectothrix?

What is Endothrix?

A

Fungal infection of hair from outside or inside.

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9
Q

What organism is Tinea Versicolor?

A

Malassezia furfur

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10
Q

What are the general properties of Tinea Versicolor aka Malassezia furfur?

A

Dimorphic with yeast and hyphae present in infected tissue.

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11
Q

What are the clinical features of Tinea Versicolor aka Malassezia furfur?

A

Hypopigmented areas appear on the skin

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12
Q

What organism is Tinea nigra?

A

Cladosporium werneckii

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13
Q

What are the general properties of Tinea Nigra aka Cladosporium werneckii?

A

Dimorphic with yeast and hyphae present in infected tissue.

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14
Q

What are the clinical features of Tinea Nigra aka Cladosporium werneckii?

A

Brownish spots on skin caused by melanin production by the fungus

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15
Q

What is the pathogenesis of Anthrophilic fungi?

A

Fragments of infected human skin or other superficial tissue come into contact with uninfected hosts. Hyphae invade and spread.

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16
Q

What is the source of Zoophilic fungi?

A

Animals, including pets

17
Q

What is the source of Geophilic fungi?

A

Soil

18
Q

What type of fungi (Anthro, Zoo, or Geo) is…
T. rubrum?
Microsporum canum?
Cladosporium werneckii?

A

T: Anthro
M: Zoo
C: Geo

19
Q

What is the Dx of cutaneous fungi?

A

KOH mounts of clinical specimens are performed to detect fungal elements consistent with clinical picture.
Culture may be necessary for identification of specific macronidia by morphology

20
Q

What is Tx of Cutaneous Mycoses?

A

Topical anti-fungal creams

21
Q

What is Px for Cutaneous Mycoses?

A

Avoid exposure
Reduce skin moisture
I.D. the fungus by culture is helpful for I.D. the source fo infection and eliminating the source.

22
Q

What are the natural environments of SUBcutaneous fungi?

A

Plants
Soil
(not animals)

23
Q

How do SUBcutaneous fungi infect animal host?

A

Puncture or abrasion

24
Q

What fungus causes Sporotrichosis?

A

Sporothrix shenkii

25
Q

What are the general properties of Sporothrix shenkii aka Sporotrichosis?

A

Classical dimorphism growing as yeast in host tissue and hyphae in the environment.

26
Q

What shape are Sporothrix shenkii aka Sporotrichosis as yeast in tissues?

A

Cigar shaped.

27
Q

What are the pathogenesis and clinical features of Sporothrix shenkii aka Sporotrichosis?

A

Introduced by puncture

Nodular lesions emanate from site of inoculation.

28
Q

What occurs in immunosuppressed patients that have been infected with Spororthrix shenkii aka Sporotrichosis?

A

Disseminated infection

29
Q

What fungus cause Chromoblastomycosis?

A

Several soil fungus termed dematicaceous fungi (fungus with brown to black melanin

30
Q

How does the fungus that causes Chromoblastomycosis infect the host?

A

Introduced by puncture

31
Q

What are the clinical features of Chromoblastomycosis?

A

Slow growing wart-like lesions containing brown fungal cells

32
Q

What is Dx of SUBcutaneous mycoses?

A

KOH mounts may be useful if lesions appear on surface of skin
Biopsies followed by histology and culture may be required to demonstrate fungi in infected tissue

33
Q

What is the Tx for SUBcutaneous mycoses?

A

Oral AZOLE therapy

Surgery may be required

34
Q

What is Px for SUBcutaneous mycoses?

A

Wear protective clothing when coming into contact with abrasive plant structures

Micro Quiz 4 Final (10 decks)

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