Clinically Important Dermatophytes Quiz
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Questions and Answers

Which pathogen infects SKIN and NAILS only?

  • Epidermophyton floccosum (correct)
  • Trichophyton tonsurans
  • Trichophyton mentagrophytes
  • Trichophyton rubrum

Which pathogen produces a white, cottony surface and a deep red non-diffusible pigment when viewed from the reverse side of the colony?

  • Trichophyton tonsurans
  • Trichophyton rubrum (correct)
  • Epidermophyton floccosum
  • Trichophyton mentagrophytes

Which pathogen develops cylindric smooth walled macroconidia and characteristic microconidia?

  • Trichophyton tonsurans
  • Trichophyton rubrum
  • Epidermophyton floccosum
  • Trichophyton mentagrophytes (correct)

Which pathogen produces flat, powdery to velvety colonies that become reddish brown on the reverse?

<p>Trichophyton tonsurans (B)</p> Signup and view all the answers

Which of the following genera is known to produce multicellular macroconidia with echinulate walls?

<p>Microsporum (A)</p> Signup and view all the answers

In lesions, which of the following genera form septate hyphae and asexual spores with powdery and pigmented colonies?

<p>Microsporum (C)</p> Signup and view all the answers

Which species is known to form a colony with a white cottony surface and a deep yellow color on the reverse side, with thick-walled, 8-15 celled macroconidia with curved or hooked tips?

<p>Microsporum canis (A)</p> Signup and view all the answers

Which of the following genera infects HAIR and SKIN only?

<p>Microsporum (A)</p> Signup and view all the answers

Which of the following genera produce a tan, powdery colony with abundant thin-walled 4- to -6 celled macroconidia?

<p>Microsporum gypseum (D)</p> Signup and view all the answers

Which genus is differentiated mainly by the nature of their macroconidia?

<p>Microsporum (C)</p> Signup and view all the answers

Study Notes

Skin and Nail Infections

  • Trichophyton infects skin and nails only.

Colony Characteristics

  • Trichophyton produces a white, cottony surface and a deep red non-diffusible pigment when viewed from the reverse side of the colony.

Macroconidia Characteristics

  • Microsporum develops cylindric, smooth-walled macroconidia and characteristic microconidia.

Colony Color and Macroconidia

  • Microsporum produces flat, powdery to velvety colonies that become reddish brown on the reverse side.

Macroconidia Walls and Genera

  • Echinococcus is known to produce multicellular macroconidia with echinulate walls.

Lesion Characteristics and Genera

  • Trichophyton forms septate hyphae and asexual spores with powdery and pigmented colonies in lesions.

Colony Color and Macroconidia Shapes

  • Trichophyton species form a colony with a white cottony surface and a deep yellow color on the reverse side, with thick-walled, 8-15 celled macroconidia with curved or hooked tips.

Hair and Skin Infections

  • Microsporum infects hair and skin only.

Colony Color and Macroconidia Characteristics

  • Epidermophyton produces a tan, powdery colony with abundant thin-walled 4- to 6-celled macroconidia.

Genera Differentiation

  • Genera are differentiated mainly by the nature of their macroconidia.

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Description

Test your knowledge on the identification and clinical significance of Microsporum spp, Epidermophyton spp, and Trichophyton spp in dermatophyte infections, also known as ringworm or Tinea. Understand the characteristics and impact of these filamentous fungi on superficial keratinized tissues like skin, hair, and nails.

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