Question 1

A patient with leukemia is diagnosed with a Candida infection after receiving several doses of chemotherapy.The most likely yeast causing the infection is:

Accepted Answer

A)   C. albicans.
B)   C. parapsilosis.
C)   C. tropicalis.
D)   C. metapsilosis. C

Question 2

MATCHING
Match the organism with its characteristics.
-"Spaghetti and meatball" morphologic appearance

Accepted Answer

A)  Trichosporon spp.
B)  Candida albicans
C)  Malassezia furfur
D)  Cryptococcus neoformans C

Question 3

Tinea versicolor is a skin infection characterized by superficial brownish scaly areas most often on the trunk, arms, or shoulders.Which type of replacement therapy places patients at risk for developing this type of skin infection?

Accepted Answer

A)   Hormone
B)   Lipid
C)   Saccharide
D)   Gene B

Question 4

Which yeast identification system uses chromogenic substrates to assess specific enzyme activity usually detected within 4 hours?

Accepted Answer

A)   Vitek
B)   MicroScan
C)   API-20C AUX
D)   Uni-Yeast-Tek

Question 5

Encapsulated yeast is identified in the cerebrospinal fluid (CSF)of a patient with AIDS.The most likely stain or reagent used to identify this organism is:

Accepted Answer

A)   potassium hydroxide (KOH) .
B)   calcofluor white.
C)   lactophenol cotton blue.
D)   India ink.

Question 6

Agar medium overlaid with olive oil will enhance the growth of which organism?

Accepted Answer

A)   Malassezia
B)   Candida
C)   Trichosporon
D)   Cryptococcus

Question 7

The most commonly isolated yeast in clinical specimens is:

Accepted Answer

A)   Candida albicans.
B)   C. tropicalis.
C)   C. dubliniensis.
D)   C. krusei.

Question 8

MATCHING
Match the organism with its characteristics.
-White piedra

Accepted Answer

A)  Trichosporon spp.
B)  Candida albicans
C)  Malassezia furfur
D)  Cryptococcus neoformans

Question 9

Blood cultures are drawn on a patient suspected of having a fungemia.Positive cultures reveal the presence of chlamydoconidia on cornmeal agar.In addition, the yeast is germ-tube positive.The most likely identification of the fungal agent is:

Accepted Answer

A)   C. glabrata.
B)   C. tropicalis.
C)   Cryptococcus neoformans.
D)   C. albicans.

Question 10

If cornmeal agar is set up and chlamydoconidia are produced, the organism is most likely:

Accepted Answer

A)   C. krusei.
B)   C. glabrata.
C)   C. albicans.
D)   C. tropicalis.

Question 11

A fungal infection found mostly in the tropics and temperate regions is characterized by the development of soft, yellow or pale-brown aggregations around hair shafts in the axillary, facial, genital, and scalp regions.The fungus that would most likely be isolated is:

Accepted Answer

A)   Candida.
B)   Malassezia.
C)   Cryptococcus.
D)   Trichosporon.

Question 12

In general, yeast reproduce asexually by the formation of:

Accepted Answer

A)   ascospores.
B)   basidiospores.
C)   blastoconidia.
D)   arthroconidia.

Question 13

Cryptococcus neoformans is widely distributed in nature, and aerosolization is a prerequisite to most infections.This organism is most often associated with exposure to:

Accepted Answer

A)   contaminated soil.
B)   pigeon excreta.
C)   contaminated food.
D)   rat excreta.

Question 14

MATCHING
Match the organism with its characteristics.
-Creamy, white patches

Accepted Answer

A)  Trichosporon spp.
B)  Candida albicans
C)  Malassezia furfur
D)  Cryptococcus neoformans

Question 15

Determining urease activity and growth on niger seed agar is helpful in determining which type of yeast?

Accepted Answer

A)   Candida albicans
B)   Trichosporon
C)   Cryptococcus neoformans
D)   Malassezia furfur

Question 16

A patient with diabetes is experiencing creamy patches on his tongue and mucous membranes.Cultures are performed, and yeast is recovered.His diagnosis is most likely:

Accepted Answer

A)   paronychia.
B)   onychomycosis.
C)   candidemia.
D)   thrush.

Question 17

A patient with acquired immunodeficiency syndrome (AIDS)notices skin lesions on his back that have begun to ulcerate.Upon physical examination, his physician also notices hepatomegaly that is most likely caused by hepatitis.The physician prescribes antifungal therapy to prevent the dissemination of which of the following yeasts?

Accepted Answer

A)   Candida albicans
B)   C. neoformans
C)   C. glabrata
D)   C. tropicalis

Question 18

MATCHING
Match the organism with its characteristics.
-Polysaccharide capsule

Accepted Answer

A)  Trichosporon spp.
B)  Candida albicans
C)  Malassezia furfur
D)  Cryptococcus neoformans

Exam 62: The Yeasts

A patient with leukemia is diagnosed with a Candida infection after receiving several doses of chemotherapy.The most likely yeast causing the infection is:

MATCHING Match the organism with its characteristics. -"Spaghetti and meatball" morphologic appearance

Tinea versicolor is a skin infection characterized by superficial brownish scaly areas most often on the trunk, arms, or shoulders.Which type of replacement therapy places patients at risk for developing this type of skin infection?

Which yeast identification system uses chromogenic substrates to assess specific enzyme activity usually detected within 4 hours?

Encapsulated yeast is identified in the cerebrospinal fluid (CSF) of a patient with AIDS.The most likely stain or reagent used to identify this organism is:

Agar medium overlaid with olive oil will enhance the growth of which organism?

The most commonly isolated yeast in clinical specimens is:

MATCHING Match the organism with its characteristics. -White piedra

Blood cultures are drawn on a patient suspected of having a fungemia.Positive cultures reveal the presence of chlamydoconidia on cornmeal agar.In addition, the yeast is germ-tube positive.The most likely identification of the fungal agent is:

If cornmeal agar is set up and chlamydoconidia are produced, the organism is most likely:

A fungal infection found mostly in the tropics and temperate regions is characterized by the development of soft, yellow or pale-brown aggregations around hair shafts in the axillary, facial, genital, and scalp regions.The fungus that would most likely be isolated is:

In general, yeast reproduce asexually by the formation of:

Cryptococcus neoformans is widely distributed in nature, and aerosolization is a prerequisite to most infections.This organism is most often associated with exposure to:

MATCHING Match the organism with its characteristics. -Creamy, white patches

Determining urease activity and growth on niger seed agar is helpful in determining which type of yeast?

A patient with diabetes is experiencing creamy patches on his tongue and mucous membranes.Cultures are performed, and yeast is recovered.His diagnosis is most likely:

MATCHING Match the organism with its characteristics. -Polysaccharide capsule