2 b dermatophytes
DESCRIPTION
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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