Urea Agar Is Set Up for Quality Control Purposes Using

question 4

Multiple Choice

Urea agar is set up for quality control purposes using two Trichophyton spp.-T.mentagrophytes and T.rubrum.After the appropriate amount of incubation,both organisms are negative.Which one of the following statements explains this discrepancy?

• A)The medium is most likely expired.
• B)These two Trichophyton spp.are poor choices for quality control.
• C)The phenol red indicator is not working because both organisms are positive for urea.
• D)No discrepancy is present;both organisms are negative for urease activity.

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