Microbiology: Infectious Agent Identification Quiz

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27 Questions

Which pair of yeasts are most closely related?

Candida albicans and Candida dubliniensis

Which of the following tests is used for the presumptive identification of Candida albicans?

Candida albicans

Which yeast isolate produces only blastoconidia on cornmeal Tween 80 agar?

Candida spp.

Which yeast isolate is capable of forming ascospores?

Saccharomyces cerevisiae

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

Rhodotorula spp.

Which Candida species is known to produce chlamydospores?

C. albicans

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

Colorado River Valley

What is the cause of white piedra?

Piedraia hortae

Which species is a keratinophilic saprophyte?

Microsporum gypseum

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

Trichophyton spp.

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

T. schoenleinii

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

T. mentagrophytes and T. rubrum

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:

Dematiaceous mold

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?

Scopulariopsis spp.

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

Phialophora spp.

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

Fusarium spp.

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

A. flavus

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

Rhizopus spp.

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

Cryptococcus neoformans

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

The mold is producing the pigments as a byproduct of its metabolic processes.

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

To protect the basal portion of the vesicle from desiccation and environmental stresses.

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

Candida albicans

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?

Trichophyton mentagrophytes

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

Encapsulated yeast cells are characteristic.

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

Soil contaminated with bird or bat droppings

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

Arid and semi-arid regions

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

Decaying wood and bird droppings

Test your knowledge on identifying infectious agents in clinical specimens. Questions cover common microorganisms found in urine, sputum, and feces, as well as their clinical significance. See if you can pinpoint the responsible agent for a specific skin lesion in a case scenario.

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