Exam 61: The Yeasts

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?

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

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:

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?

Match the organism with its characteristics. -White piedra

The most commonly isolated yeast in clinical specimens is:

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

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

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:

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

In general,yeast reproduces asexually by the formation of:

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:

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

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

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:

Match the organism with its characteristics. -Polysaccharide capsule

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

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