Structure of Dermatophytes

Question 1

Organisms that may cause cutaneous mycoses are called

Answer 1

Dermatophytes

Question 2

absent microconidia

Answer 2

E. floccosum

Question 3

Sparse, clavate, sessile microconidia

Answer 3

M. canis
M. gypseum

Question 4

Rare, chlamydospore-like microconidia

Answer 4

M. audouinii

Question 5

Grape-like clusters microconidia

Answer 5

T. mentagrophytes

Question 6

Tear-shaped, birds on fence microconidia

Answer 6

T. rubrum

Question 7

Balloon-shaped microconidia

Answer 7

T. tonsurans

Question 8

Infects skin and nails

Answer 8

Epidermophyton

Question 9

Infects hair and skin

Answer 9

Microsporum

Question 10

Infects hair, skin, and nails

Answer 10

Trichophyton

Question 11

Differential Tests on Trichophyton spp. (HUT)

M
R
T

Answer 11

Differential Tests on Trichophyton spp.

M + + -
R - - -
T - + +

Question 12

Poor growth in rice grains

Answer 12

M. audouinii

Question 13

Good growth in rice grains

Answer 13

M. canis
M. gypseum

Question 14

(+) Wood’s lamp fluorescence
(364 nm)

Answer 14

M. audouinii
M. canis

Question 15

(-) Wood’s lamp fluorescence
(364 nm)

Answer 15

M. gypseum

Question 16

Cylindrical macroconidia

Answer 16

T. tonsurans

Question 17

• Pencil-shaped macroconidia
• red pigment on Cornmeal agar

Answer 17

T. rubrum

Question 18

Cigar-shaped macroconidia

Answer 18

T. mentagrophytes

Question 19

• Chlamydoconidia-like swellings,
• bizzare-shaped

Answer 19

M. audouinii

Question 20

Broadly spindle-shaped with rounded ends macroconidia

Answer 20

M. gypseum

Question 21

• Spindle-shaped
• tapered ends
• echinulate thick walls

Answer 21

M. canis

Question 22

• Broad/spatulate/ beaver’s tail ,
• contains 2-5 cells by perpendicular cross walls

Answer 22

E. floccosum