Multiple choice

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

  1. Enterobacter aerogenes and Escherichia coli

  2. Enterobacter aerogenes and Proteus mirabilis

  3. Escherichia coli and Klebsiella pneumoniae

  4. Escherichia coli and Proteus mirabilis

  5. Enterobacter aerogenes and Klebsiella pneumoniae
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E Correct answer
Explanation

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 color indicates a negative result. Both Enterobacter aerogenes and Klebsiella pneumoniae give positive Voges–Proskauer test.

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