7. Dermatophytes Flashcards Preview

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Flashcards in 7. Dermatophytes Deck (47):
1

Animal to human route of infection

Zoophilic

2

Person to person route of infection

Anthropophilic

3

Infection of facial hair

Tinea barbae (Barber's itch)

4

Infection of the scalp

Tinea capitis

5

Infection of the arms, legs, and trunk

Tinea corporis (ringworm)

6

Infection of the groin area

Tinea cruris (Jock itch)

7

Infection of the face

Tinea faciei

8

Infection of the hands

Tinea manuum

9

Infection of the spaces between toes

Tinea pedis (Athlete's foot)

10

Infection of the fingernails ans toenails

Tinea unguinum

11

Infection of the hair follicle, crusty lesions

Favic

12

Infection that colonizes the outside part of the hair shaft

Ectothrix

13

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

Endothrix

14

Infection of the nail and nail bed

Onchomycosis

15

Specimens for dermatophyte ID

Hair
Hair scraping
Nail scraping or clipping

16

Modification of KOH preparation for dermatophyte ID

Calcofluor

17

Temp and time for growth of dermatophytes

30°C for 4 weeks on SDA

18

3 major genera under Dermatophytes

Microsporum
Epidermophyton
Trichophyton

19

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

Trichophyton

20

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

Microsporum

21

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

Epidermophyton

22

Geophilic dermatophytes

Microsporum gypseum
Microsporum nanum
Trichophyton rubrum

23

Zoophilic dermatophytes

Microsporum canis
Trichophyton mentagrophytes

24

Anthropophilic dermatophytes

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