Microbiology: Infectious Agent Identification Quiz
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Questions and Answers

Which pair of yeasts are most closely related?

  • Candida albicans and Candida dubliniensis (correct)
  • Trichosporon cutaneum and Cryptococcus neoformans
  • Saccharomyces cerevisiae and Candida glabrata
  • Candida albicans and Candida tropicalis
  • Which of the following tests is used for the presumptive identification of Candida albicans?

  • Candida albicans (correct)
  • Trichosporon cutaneum
  • Rhodotorula rubra
  • Cryptococcus neoformans
  • Which yeast isolate produces only blastoconidia on cornmeal Tween 80 agar?

  • Candida spp. (correct)
  • Cryptococcus spp.
  • Geotrichum spp.
  • Trichosporon spp.
  • Which yeast isolate is capable of forming ascospores?

    <p>Saccharomyces cerevisiae</p> Signup and view all the answers

    Which is the most likely identification for a germ tube–negative, pink yeast isolate recovered from a patient with AIDS?

    <p>Rhodotorula spp.</p> Signup and view all the answers

    Which Candida species is known to produce chlamydospores?

    <p>C. albicans</p> Signup and view all the answers

    Which environment is most commonly associated with an increased incidence of Histoplasmosis?

    <p>Colorado River Valley</p> Signup and view all the answers

    What is the cause of white piedra?

    <p>Piedraia hortae</p> Signup and view all the answers

    Which species is a keratinophilic saprophyte?

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

    Which of the following is the most likely identification for the fungal species described in the text?

    <p>Trichophyton spp.</p> Signup and view all the answers

    Which Trichophyton species causes the favus type of tinea capitis seen in the Scandinavian countries and in the Appalachian region of the United States?

    <p>T. schoenleinii</p> Signup and view all the answers

    The Hair Baiting Test is used to differentiate which two species of Trichophyton that produce red colonies on Sabouraud agar plates?

    <p>T. mentagrophytes and T. rubrum</p> Signup and view all the answers

    A mold that produces colonies with a dark brown, green-black, or black appearance of both the surface and reverse side is classified as a:

    <p>Dematiaceous mold</p> Signup and view all the answers

    A rapidly growing hyaline mold began as a white colony but soon developed a black "pepper" effect on the agar surface. The older colony produced a black matte, making it resemble a dematiaceous mold. What is the most likely identification?

    <p>Scopulariopsis spp.</p> Signup and view all the answers

    Which dematiaceous mold forms flask-shaped phialides, each with a flask-shaped collarette?

    <p>Phialophora spp.</p> Signup and view all the answers

    What is the most likely identification of the hyaline mold recovered from the AIDS patient?

    <p>Fusarium spp.</p> Signup and view all the answers

    Which Aspergillus spp. is most likely responsible for the fungus-ball infection described?

    <p>A. flavus</p> Signup and view all the answers

    What is the most likely identification of the rapidly growing, nonseptate mold that produced cotton candy-like colonies?

    <p>Rhizopus spp.</p> Signup and view all the answers

    Which yeast was the cause of meningitis in the HIV-infected male patient?

    <p>Cryptococcus neoformans</p> Signup and view all the answers

    What is the most likely reason for the rose-colored colonies with lavender centers produced by the hyaline mold from the AIDS patient?

    <p>The mold is producing the pigments as a byproduct of its metabolic processes.</p> Signup and view all the answers

    Why did the Aspergillus spp. responsible for the fungus-ball infection only sporulate from the top half of the vesicles?

    <p>To protect the basal portion of the vesicle from desiccation and environmental stresses.</p> Signup and view all the answers

    Which of the following fungi is considered normal microflora but can also cause clinically significant infections?

    <p>Candida albicans</p> Signup and view all the answers

    Based on the clinical presentation, which fungal agent is most likely responsible for the child's hair loss and fluorescence under a Wood's lamp?

    <p>Trichophyton mentagrophytes</p> Signup and view all the answers

    Which statement is true about the histopathology of Histoplasma capsulatum infection?

    <p>Encapsulated yeast cells are characteristic.</p> Signup and view all the answers

    Which environment is most commonly associated with an increased incidence of blastomycosis?

    <p>Soil contaminated with bird or bat droppings</p> Signup and view all the answers

    Which environment is most commonly associated with an increased incidence of coccidioidomycosis?

    <p>Arid and semi-arid regions</p> Signup and view all the answers

    Which environment is most commonly associated with an increased incidence of cryptococcosis?

    <p>Decaying wood and bird droppings</p> Signup and view all the answers

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