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Dermatophytes (Superficial Mycoses)

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) .

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Dermatophytes (Superficial Mycoses)

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  1. Dermatophytes(Superficial Mycoses) (Skin Plants)

  2. Tinea Ringworm (moth)

  3. Tinea corporis(the body)

  4. Tinea pedis(feet)

  5. Tinea unguium(nails)

  6. Tinea capitis(scalp)

  7. Tinea cruris(jock itch)

  8. Tinea barbae(bearded area)

  9. Tinea versicolor (Spaghetti and meatballs)

  10. Ecology of Dermatophytes To determine the source of infection • Anthropophilic • Zoophilic • Geophilic

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

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

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

  14. Geographic Distribution Worldwide

  15. Dermatophytes3 Genera • Trichophyton • Microsporum • Epidermophyton

  16. Trichophyton (19 species) • Hair • Skin • Nails

  17. Trichophyton species Large, smooth, thin wall, septate, pencil-shaped

  18. Trichophyton rubrum Causes a chronic infection in patients with a cell-mediated immune defect. (most common in SC blacks)

  19. Microsporum(13 species) • Skin • Hair

  20. Microsporum species Thick wall, spindle shape, multicellular

  21. Microsporum canis . Most common etiologic agent of tinea in SC whites

  22. Epidermophyton floccosum • Skin • Nails

  23. Epidermophyton floccosum Bifurcated hyphae with multiple, smooth, club shaped macroconidia (2-4 cells)

  24. Therapy • Griseofulvin • Tinactin • Clotrimazole • Miconazole • Ketoconazole • Itraconazole • Terbinafine

  25. Dermatophytid Reaction(ID) • Dermatophyte infection on feet (not clinically evident) • Ringworm Lesion on hand (usually the dominant side)

  26. Dermatophytid Reaction(ID) • Culture skin scrapings from feet • Treat the tinea pedis • The hand lesion (ID phenomenon) will respond to therapy of the foot.

  27. Dermatophyte Culture

  28. Dermatophyte Culture

  29. Dermatophyte Culture

  30. 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

  31. The end

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