Multiple choice

Which of the following pairs of bacteria shows negative Voges-Proskauer test?

  1. Escherichia coli and Enterobacter aerogenes

  2. Escherichia coli and Klebsiella pneumoniae

  3. Enterobacter aerogenes and Proteus mirabilis

  4. Escherichia coli and Proteus mirabilis

  5. Enterobacter aerogenes and Klebsiella pneumoniae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct. Voges–Proskauer test is used to detect acetoin in bacterial broth culture. The test is performed by adding alpha-naphthol and potassium hydroxide to the Voges-Proskauer broth, which has been inoculated with bacteria. A cherry red colour indicates a positive result, while a yellow-brown colour indicates a negative result. Both Escherichia coli and Proteus mirabilis give negative Voges–Proskauer test.

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