Dermatophytes

Question 1

Dermatophytes

Answer 1

Fungus of keratinized epithelium
Zoonotic, highly contagious

Question 2

Classic ringworm

Answer 2

Expand in circular way
Central hair regrowth but inflamed edge
Not all ringworm are classic

Question 3

Trichophyton verrucosum

Answer 3

Ringworm in cattle

Question 4

Microsporum canis

Answer 4

Cats are major asymptomatic carriers
Persian cats get pseudomycetoma

Question 5

Trichophyton mentagrophtes

Answer 5

Broad host range
Nodular kerion legions

Question 6

Microsporum gallinae

Answer 6

Avian ringworm
Favus

Question 7

Diagnosis

Answer 7

Wood lamp for flourecence (does not work for all types)
Can use toothbrush
Test periphery
Biopsy if nodular
Dermatophyte test medium in clinics, changes color

Question 8

Treatment

Answer 8

Topical or systemic antifungals
Griseofulrin acts against dermatophytes but needs oral administration to inhibit DNA synthesis

Question 9

Malassezia pachydermatis

Answer 9

Cause of otitis externa
Commensals

Question 10

Candida albicans

Answer 10

Normal flora, opportunistic
Causes thrush