Dermatophytes(Superficial Mycoses)

(Skin Plants)

Tinea

Ringworm (moth)

Tinea corporis(the body)

Tinea pedis(feet)

Tinea unguium(nails)

Tinea capitis(scalp)

Tinea cruris(jock itch)

Tinea barbae(bearded area)

Tinea versicolor

(Spaghetti and meatballs)

SINH THÁI DERMATOPHYTES(Ecology of Dermatophytes)

Mục đích: xác định nguồn lây nhiễm(To determine the source of infection)

• Nhóm ưa người-Anthropophilic• Nhóm ưa động vật-Zoophilic• Nhóm ưa đất-Geophilic

Anthropophilic

Associated with humans only. Person -to-person transmission through contaminated objects (comb, hat, etc.)

Zoophilic

Associated with animals. Direct transmission to humans by close contact with animals.

Geophilic

Usually found in soil. Transmitted to humans by direct exposure.

Geographic Distribution

Worldwide

Dermatophytes3 Genera

• Trichophyton• Microsporum• Epidermophyton

Trichophyton (19 loài)

• Tóc • Da• Móng

Các loài Trichophyton

Đại bào tử hình bút chì, có vách ngăn, thành tế bào mỏng, nhẵn

Trichophyton rubrum

Causes a chronic infection in patients with a cell-mediated immune defect.

(most common in SC blacks)

Microsporum(13 loài)

• Da• tóc

Các loài Microsporum

Đại bào tử có thành dày, hình thoi, đa bào

Microsporum canis

.Most common etiologic agent of tinea

in SC whites

Epidermophyton floccosum

• Da• Móng

Epidermophyton floccosum

Các sợi phân nhánh với các đại bào tử hình chuỳ, nhẵn, đa bào (2-4 tế bào)

Liệu pháp

• Griseofulvin• Tinactin• Clotrimazole• Miconazole• Ketoconazole• Itraconazole• Terbinafine

Dermatophytid Reaction(ID)

• Dermatophyte infection on feet (not clinically evident)

• Ringworm Lesion on hand (usually the dominant side)

Dermatophytid Reaction(ID)

• Culture skin scrapings from feet

• Treat the tinea pedis

• The hand lesion (ID phenomenon) will respond to therapy of the foot.

Dermatophyte Culture

Dermatophyte Culture

Dermatophyte Culture

Dermatophytes

• It is not necessary to be an athlete to get athlete’s foot.

• A tinea (moth) does not cause skin lesions

• There are no worms in ringworm

The end