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.
Correct Answer:
Verified
Correct Answer:
Verified
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