Dermatophytes

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Dermatophytes

  1. 1. Dermatophytes (Superficial Mycoses) (Skin Plants) www.freelivedoctor.com
  2. 2. Tinea Ringworm (moth) www.freelivedoctor.com
  3. 3. Tinea corporis (the body) www.freelivedoctor.com
  4. 4. Tinea pedis (feet) www.freelivedoctor.com
  5. 5. Tinea unguium (nails) www.freelivedoctor.com
  6. 6. Tinea capitis (scalp) www.freelivedoctor.com
  7. 7. Tinea cruris (jock itch) www.freelivedoctor.com
  8. 8. Tinea barbae (bearded area) www.freelivedoctor.com
  9. 9. Tinea versicolor (Spaghetti and meatballs) www.freelivedoctor.com
  10. 10. Ecology of Dermatophytes <ul><li>To determine the source of infection </li></ul><ul><li>Anthropophilic </li></ul><ul><li>Zoophilic </li></ul><ul><li>Geophilic </li></ul>www.freelivedoctor.com
  11. 11. Anthropophilic Associated with humans only. Person -to-person transmission through contaminated objects (comb, hat, etc.) www.freelivedoctor.com
  12. 12. Zoophilic Associated with animals. Direct transmission to humans by close contact with animals. www.freelivedoctor.com
  13. 13. Geophilic Usually found in soil. Transmitted to humans by direct exposure. www.freelivedoctor.com
  14. 14. Geographic Distribution Worldwide www.freelivedoctor.com
  15. 15. Dermatophytes 3 Genera <ul><li>Trichophyton </li></ul><ul><li>Microsporum </li></ul><ul><li>Epidermophyton </li></ul>www.freelivedoctor.com
  16. 16. Trichophyton (19 species) <ul><li>Hair </li></ul><ul><li>Skin </li></ul><ul><li>Nails </li></ul>www.freelivedoctor.com
  17. 17. Trichophyton species Large, smooth, thin wall, septate, pencil-shaped www.freelivedoctor.com
  18. 18. www.freelivedoctor.com
  19. 19. Trichophyton rubrum Causes a chronic infection in patients with a cell-mediated immune defect. (most common in SC blacks) www.freelivedoctor.com
  20. 20. www.freelivedoctor.com
  21. 21. Microsporum (13 species) <ul><li>Skin </li></ul><ul><li>Hair </li></ul>www.freelivedoctor.com
  22. 22. Microsporum species Thick wall, spindle shape, multicellular www.freelivedoctor.com
  23. 23. Microsporum canis . Most common etiologic agent of tinea in SC whites www.freelivedoctor.com
  24. 24. Epidermophyton floccosum <ul><li>Skin </li></ul><ul><li>Nails </li></ul>www.freelivedoctor.com
  25. 25. Epidermophyton floccosum Bifurcated hyphae with multiple, smooth, club shaped macroconidia (2-4 cells) www.freelivedoctor.com
  26. 26. Therapy <ul><li>Griseofulvin </li></ul><ul><li>Tinactin </li></ul><ul><li>Clotrimazole </li></ul><ul><li>Miconazole </li></ul><ul><li>Ketoconazole </li></ul><ul><li>Itraconazole </li></ul><ul><li>Terbinafine </li></ul>www.freelivedoctor.com
  27. 27. Dermatophytid Reaction (ID) <ul><li>Dermatophyte infection on feet </li></ul><ul><ul><li>(not clinically evident) </li></ul></ul><ul><li>Ringworm Lesion on hand </li></ul><ul><li>(usually the dominant side) </li></ul>www.freelivedoctor.com
  28. 28. Dermatophytid Reaction (ID) <ul><li>Culture skin scrapings from feet </li></ul><ul><li>Treat the tinea pedis </li></ul><ul><li>The hand lesion (ID phenomenon) will respond to therapy of the foot. </li></ul>www.freelivedoctor.com
  29. 29. Dermatophyte Culture www.freelivedoctor.com
  30. 30. Dermatophytes <ul><li>It is not necessary to be an athlete to get athlete’s foot. </li></ul><ul><li>A tinea (moth) does not cause skin lesions </li></ul><ul><li>There are no worms in ringworm </li></ul>www.freelivedoctor.com

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