Sierra College Department of Biological Sciences

Microbiology Diagnostic Tests: Voges Proskauer (VP) Test

This test is used to determine if or not bacteria can ferment glucose and form a neutral end product.


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1. Which of these tubes contains organisms that test positive for the Voges Proskauer test?

2. What end product of glucose fermentation is being tested for here?

3. The completion of this test requires that a 1ml sample of MR-VP broth containing a 48 hour culture be transferred into a clean screw-top tube, and that 18 drops of two reagents be added. What are these reagents called?

4. What action must be completed (twice) in order to obtain accurate results for the VP test?

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