A Microbiologist Is Looking at a Sheep Blood Agar (SBA)

question 13

Multiple Choice

A microbiologist is looking at a sheep blood agar (SBA) plate from a patient who might have been exposed to a biological agent. The colonies are nonhemolytic, large, have a ground-glass appearance, and look like a Medusa's head. On Gram stain, the colonies are large gram-positive rods that seem to have central spores. What is the most probable organism?

• A) Bacillus anthracis
• B) Brucella mallei
• C) Burkholderia cepacia
• D) Yersinia pestis

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