7. Dermatophytes Flashcards

(47 cards)

1
Q

Animal to human route of infection

A

Zoophilic

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2
Q

Person to person route of infection

A

Anthropophilic

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3
Q

Infection of facial hair

A

Tinea barbae (Barber’s itch)

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4
Q

Infection of the scalp

A

Tinea capitis

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5
Q

Infection of the arms, legs, and trunk

A

Tinea corporis (ringworm)

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6
Q

Infection of the groin area

A

Tinea cruris (Jock itch)

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7
Q

Infection of the face

A

Tinea faciei

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8
Q

Infection of the hands

A

Tinea manuum

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9
Q

Infection of the spaces between toes

A

Tinea pedis (Athlete’s foot)

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10
Q

Infection of the fingernails ans toenails

A

Tinea unguinum

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11
Q

Infection of the hair follicle, crusty lesions

A

Favic

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12
Q

Infection that colonizes the outside part of the hair shaft

A

Ectothrix

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13
Q

Infection of the hair follicle first, then grows inside the shaft

A

Endothrix

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14
Q

Infection of the nail and nail bed

A

Onchomycosis

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15
Q

Specimens for dermatophyte ID

A

Hair
Hair scraping
Nail scraping or clipping

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16
Q

Modification of KOH preparation for dermatophyte ID

A

Calcofluor

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17
Q

Temp and time for growth of dermatophytes

A

30°C for 4 weeks on SDA

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18
Q

3 major genera under Dermatophytes

A

Microsporum
Epidermophyton
Trichophyton

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19
Q

Macroconidia: rare, thin-walled, smooth
Microconidia: numerous

20
Q

Macroconidia: numerous, thick-walled, rough
Microconidia: usually present

21
Q

Macroconidia: numerous, thin- and thick-walled, smooth
Microconidia: not formed

A

Epidermophyton

22
Q

Geophilic dermatophytes

A

Microsporum gypseum
Microsporum nanum
Trichophyton rubrum

23
Q

Zoophilic dermatophytes

A

Microsporum canis

Trichophyton mentagrophytes

24
Q

Anthropophilic dermatophytes

A
Microsporum audouinii
Epidermophyton floccosum
Trichophyton mentagrophytes
Trichophyton tonsurans
Trichophyton schoenleinii
25
Has rare distorted macroconidia, rare microconidia
Microsporum audouinii
26
No growth on sterile rice media
Microsporum audouinii
27
Has large spindle-shaped macroconidia (3-15 cells, tapering ends)
Microsporum canis
28
Has "rowboat"-shaped macroconidia
Microsporum gypseum
29
Powdery/granular buff to brown colony
Microsporum gypseum
30
Rare cause of tinea corporis in humans
Microsporum nanum
31
Causes tinea cruris, pedis, and unguium
Epidermophyton floccosum
32
Has khaki-yellow colonies
Epidermophyton floccosum
33
As smooth-walled, club-shaped, groupings of macoconidia (beaver's tail)
Epidermophyton floccosum
34
Infects all 3 keratinized tissues
Trichophyton mentagrophytes
35
Most common cause of athlete's foot
Trichophyton mentagrophytes
36
Has spiral hyphae
Trichophyton mentagrophytes
37
Microconidia: round, clustering Macroconidia: cigar-shaped
Trichophyton mentagrophytes
38
Perforates hair
Trichophyton mentagrophytes
39
Urease positive
Trichophyton mentagrophytes
40
Ectothrix dermatophyte
Trichophyton rubrum
41
Endothrix dermatophytes
Trichophyton tonsurans | Trichophyton schoenleinii
42
Tear-drop shaped microconidia
Trichophyton rubrum
43
"Black dot" tinea capitis
Trichophyton tonsurans
44
Vitamin needed by Trichophyton tonsurans
Thiamine
45
Dermatophyte that requires thiamine
Trichophyton tonsurans
46
Has antler-shaped hyphae
Trichophyton schoenleinii
47
Soil to man route of infection
Geophilic