Malassezia Infections and Diagnosis Quiz
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Questions and Answers

Which of the following is a characteristic morphological appearance of Malassezia furfur in potassium hydroxide (KOH) preparations of skin scrapings?

  • Spaghetti and meatballs appearance (correct)
  • Ramen and dumplings appearance
  • Banana and coconut appearance
  • Hotdog and ketchup appearance

    • What is the characteristic fluorescence observed under Wood's lamp for lesions caused by Malassezia furfur?

  • Blue fluorescence
  • Golden yellow fluorescence (correct)
  • Red fluorescence
  • Green fluorescence

    • Which of the following conditions is NOT associated with Malassezia furfur?

  • Seborrheic dermatitis
  • Folliculitis
  • Opportunistic fungemia
  • Candidiasis (correct)

    • What is the characteristic morphology of Malassezia spp. cells observed in Gram stain preparations from culture?

    <p>Oval or bottle-shaped cells with monopolar budding and a septum at the bud scar</p> Signup and view all the answers

    Which of the following conditions is also known as 'Malassezia catheter-associated sepsis'?

    <p>Systemic infection</p> Signup and view all the answers

    Which of the following conditions is mentioned in the text as being associated with Malassezia furfur?

    <p>Eczema/dermatitis syndrome atopic</p> Signup and view all the answers

    What is the etiologic agent responsible for pityriasis versicolor?

    <p>Malassezia furfur complex</p> Signup and view all the answers

    What is the most common presentation of pityriasis versicolor?

    <p>Fawn-colored macules</p> Signup and view all the answers

    Which of the following best describes Malassezia furfur?

    <p>Lipophilic yeasts that require lipid in the medium for growth</p> Signup and view all the answers

    What type of infection is pityriasis versicolor in immunologically normal patients?

    <p>Superficial infection of the stratum corneum</p> Signup and view all the answers

    Which skin areas are commonly affected by pityriasis versicolor?

    <p>Trunk and upper arms</p> Signup and view all the answers

    Which of the following is the most common agar medium used to culture Malassezia furfur?

    <p>Sabouraud dextrose agar</p> Signup and view all the answers

    What is the typical appearance of Malassezia furfur colonies on SDA with oil overlay?

    <p>Dry, white to off-white colonies</p> Signup and view all the answers

    Which of the following is the most common laboratory diagnostic method for Tinea nigra?

    <p>Direct KOH or calcofluor white examination</p> Signup and view all the answers

    What is the primary etiologic agent of Tinea nigra?

    <p>Hortaea (Exophiala) werneckii</p> Signup and view all the answers

    Which of the following is a common clinical feature of Tinea nigra?

    <p>Blackish-brown macular patches</p> Signup and view all the answers

    Which of the following is a common treatment for Pityriasis versicolor (caused by Malassezia furfur)?

    <p>Topical selenium sulfide</p> Signup and view all the answers

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