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Fungi > Agents of Cutaneous Mycoses > Flashcards

Agents of Cutaneous Mycoses Flashcards

1
Q

Enumerate the 3 causative agents of dermatophytosis.

A

1) Trichophyton
2) Microsporum
3) Epidermophyton

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2
Q

General term for causative agents of dermatophytosis.

A

dermatophytes

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3
Q

General term for diseases associated with dermatophytes.

A

dermatophytosis

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4
Q

– a fungal disease of the keratinized tissue of humans
– keratinophilic

A

dermatomycoses

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5
Q

What are the 2 sizes of reproductive cells produced by dermatophytes?

A

microconidia and macroconidia

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6
Q

What type of reproduction is seen in dermatophytes?

A

heterothallic

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7
Q

What type of reproduction whereby it requires the combination of two distinct mating types?

A

heterothallic

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8
Q

Identify the type of dermatophyte based on habitat:

  • produce large numbers of conidia
  • most readily identified species
A

geophilic

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9
Q

Identify the type of dermatophyte based on habitat:

  • soil
A

geophilic

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10
Q

Identify the type of dermatophyte based on habitat:

  • typically adapted to live on animals
  • Fewer conidia are produced
A

zoophilic

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11
Q

Identify the type of dermatophyte based on habitat:

  • adapted exclusively to human hosts
  • almost always encountered as agents of human disease
  • infections are seldom inflammatory
A

anthropophilic

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12
Q

Identify the causative agent.

Tinea favosa

A

Trichophyton schoenleinii

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13
Q

Identify dermatophytosis:

✓ crusty lesions
✓ scutula (crusty, cup-shaped flakes) are formed
✓ hair loss, scar tissue formation

A

Tinea favosa

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14
Q

Identify dermatophytosis:

  • infection of the nails
  • subungual
  • thick
  • discolored
  • flaky
A

Onychomycosis

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15
Q

Identify dermatophytosis:

  • athlete’s foot
  • contact with infected skin scales
  • can be genetic
A

Tinea pedis

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16
Q

Identify dermatophytosis:

  • extensive scaling
  • fissuring
  • erythema
A

Tinea pedis

17
Q

What is the other name for athlete’s foot disease?

A

Moccasin foot

18
Q

Identify the dermatophyte.

▪ Favic Chandelier
▪ Moose Antler Hyphae

A

Trichophyton schoenleinii

19
Q

Describe the colony morphology of Trichophyton schoenleinii.

A

suede-like and deeply folded

20
Q

What form of tinea capitis is common among children and colonizes the outer portion of the hair shaft (ectothrix)?

A

Gray patch ringworm

21
Q

What form of tinea capitis colonizes the inside (endothrix) of the hair shaft whereby weak, brittle, infected hair shafts break off at the scalp, leaving the black dot stubs?

A

Black dot ringworm

22
Q

Identify the dermatophyte.

  • anthropophilic
  • Microconidia: chlamydospores
  • Macroconidia: odd shaped and has chlamydoconidia-like swellings
A

Microsporum audouinii

23
Q

Identify the dermatophyte.

  • Microconidia: tear-shaped or balloon-shaped
  • Macroconidia: cylindrical
A

Trichophyton tonsurans

24
Q

What treatments may be given to patients with onychomycosis?

A

terbinafine and itraconazole

25
Q

Identify the dermatophyte.

  • produces only 1 size of conidia
A

Epidermophyton floccosum

26
Q

Identify the dermatophyte.

  • yellow to yellow-tan
  • flat with feathered edges
  • small in diameter
A

Epidermophyton floccosum

27
Q

Identify the dermatophyte.

  • zoophilic
  • spindle-shaped macroconidia (3-15 cells)
A

Microsporum canis

28
Q

Identify the dermatophyte.

  • fluffy and white colonies
  • reverse side: lemon-yellow pigment, especially on potato dextrose agar
A

Microsporum canis

29
Q

Identify the dermatophyte.

  • geophilic
  • macroconidia: cigar-shaped, rounded ends (6 cells)
A

Microsporum gypseum

30
Q

Identify the dermatophyte.

  • tan to buff conidial masses are typical of fresh
    isolates
  • abundant brown to red pigment can form beneath some strains, but others remain colorless.
A

Microsporum gypseum

31
Q

Identify the dermatophyte.

  • slow-growing anthropomorphic dermatophyte
  • cottony white colonies
A

Microsporum audouinii

32
Q

Identify the dermatophyte.

  • globose and grape-like microconidia
A

Trichophyton mentagrophytes

33
Q

Identify the dermatophyte.

  • pencil-shaped macroconidia (3-8 cells)
A

Trichophyton rubrum

34
Q

What is the culture media used for Trichophyton tonsurans?

A

Sabouraud dextrose agar

35
Q

What is the leading cause of tinea capitis in children?

A

Trichophyton tonsurans

Fungi (8 decks)

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