STRUCTURE OF DERMATOPHYTES Flashcards
can cause cutaneous Mycoses
Dermatophytes
the only dermatophytes that has absent microconidia
E. floccosum
E. floccosum macroconidia (3)
➢ Broad or spatulate
➢ Beaver’s tail
➢ contains 2-5 cells by perpendicular cross walls
M. canis microconidia (3)
Sparse, clavate, sessile
M. canis macroconidia (3)
Spindle-shaped,
tapered ends,
echinulate thick walls
M. gypseum Microconidia
Broadly spindle-shaped with rounded ends
M. gypseum macroconidia
Broadly spindle-shaped with rounded ends
M. audouinii microconidia
Rare, chlamydospore like
M. audouinii macroconidia (2)
Chlamydoconidia-like swellings,
bizzare-shaped
T. mentagrophytes microconidia
Grave-like clusters
T. mentagrophytes macroconidia
Cigar-shaped
T. rubrum microconidia (2)
Tear-shaped,
birds on fence
T. rubrum macroconidia
Pencil-shaped
T. tonsurans microconidia
Balloon-shaped
T. tonsurans macroconidia
Cylindrica
Epidermophyton body parts affected
Skin and nails
Microsporum body part affected
Hair and skin
Trichophyton body parts affected
Hair, skin, and nails
T. mentagrophytes
Urease
Thiamine
Hair baiting
Urease - (+) 2days
Thiamine - negative
Hair baiting - (+) ectothrix
T. rubrum
Urease
Thiamine
Hair baiting
Urease - (-) 7days
Thiamine - negative
Hair baiting
T. tonsurans
Urease
Thiamine
Hair baiting
Urease - (+) 2days
Thiamine - positive
Hair baiting - (-) endothrix
infects the outer part of the hair follicle
Ectothrix
has the ability to penetrate inner part of the hair
Endothrix
Growth in rice grains
M. audouinii
M. canis
M. gypseum
M. audouinii - poor
M. canis - good
M. gypseum - good
Wood’s lamp fluorescence (364 nm)
M. audouinii
M. canis
M. gypseum
M. audouinii - (+)
M. canis - (+)
M. gypseum - (-)
Differential Tests on Trichophyton spp.
Urease
Thiamine
Hair baiting
