A Physician Sends a Stool Sample to Your Lab,and Wants

question 10

Multiple Choice

A physician sends a stool sample to your lab,and wants to know if there are lactose fermenting microbes in the sample.How might you determine if these microbes are present or not from this mixed-microbe specimen?

• A)Streak the sample for isolation on Thayer-Martin agar (which contains lactose and particular antibiotics for selectivity).
• B)Streak the sample for isolation on a blood agar plate (which contains lactose AND red blood cells that enrich the culture for iron).
• C)Streak the sample for isolation on a MacConkey agar plate (which contains lactose and a pH indicator that turns pink when acid byproducts are present).
• D)None of the above would work-there's no way to reliably determine this feature from the specimen given.

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