Bacteria sample A utilizes citrate while sample B does not.
Simmons citrate agar is a nutrient agar which contains the compound sodium citrate as a carbon source for microorganisms.
It is used to differentiate bacteria based on their use of citrate as a sole source of carbon.
A positive result for for citrate utilization will change the agar from green to blue while a negative result will remain green.
Therefore, since bacterial sample A produced a blue color while sample B agar remained green, A utilizes citrate while B does not.
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