Quality control should be performed on which two organisms to determine the validity of the nitrate reduction test?
a. Pasteurella aerogenes and Pasteurella dagmatis
b. M. haemolytica and Pasteurella pneumo-tropica
c. P. multocida and Suttonella indologenes
d. Pasteurella canis and Pasteurella bettyae
C
Only P. multocida and S. indologenes can be used for quality control purposes; P. multocida is nitrate reduction–positive, and S. indologenes is nitrate reduction–negative. All other organisms listed are nitrate-positive.
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