Quality control is set up to test urea agar. M. genitalium and M. hominis are used; however, both organisms are negative for urease activity. Which one of the following statements explains these findings?
a. The urea agar is most likely expired.
b. The incubation time is most likely abbre-viated.
c. A technical error has occurred.
d. These two organisms are poor choices for quality control of urea agar.
D
Both M. genitalium and M. hominis are negative for urease activity; therefore they are poor choices to test the validity of the agar. Either one of these organisms, along with U. urealyticum, should have been used; they are both negative and positive for urease activity, respectively.
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