Which organism is motile and yields an A/A glucose fermentation with VP positive?

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Multiple Choice

Which organism is motile and yields an A/A glucose fermentation with VP positive?

Motility together with a glucose fermentation pattern that shows acid in both the slant and the butt (A/A) and a positive Voges-Proskauer test points to Serratia. Serratia species are motile and can ferment glucose to produce acid (A/A) in fermentation media. They also generate acetoin via the butanediol pathway, giving a positive VP result. The other organisms either aren’t reliably motile under standard test conditions, or they don’t produce acetoin (VP positive), or they don’t show the A/A glucose fermentation pattern, so they don’t fit all three traits as neatly.

Motility together with a glucose fermentation pattern that shows acid in both the slant and the butt (A/A) and a positive Voges-Proskauer test points to Serratia. Serratia species are motile and can ferment glucose to produce acid (A/A) in fermentation media. They also generate acetoin via the butanediol pathway, giving a positive VP result. The other organisms either aren’t reliably motile under standard test conditions, or they don’t produce acetoin (VP positive), or they don’t show the A/A glucose fermentation pattern, so they don’t fit all three traits as neatly.

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