Which organism is lactose fermenting, Voges-Proskauer positive, motile, and lysine negative?

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Multiple Choice

Which organism is lactose fermenting, Voges-Proskauer positive, motile, and lysine negative?

Lactose fermentation, VP positive, motility, and lysine decarboxylase negative together point to an enteric that uses the butanediol pathway, is able to move, and does not decarboxylate lysine. Among common lactose-fermenting enterics, only Enterobacter species are motile, and many Enterobacter strains are VP positive and LDC negative. Klebsiella species are nonmotile, which rules them out despite also being lactose fermenters and VP positive. Morganella morganii does not ferment lactose, and E. coli is typically VP negative. Therefore, the organism that best fits all four traits is Enterobacter cloacae.

Lactose fermentation, VP positive, motility, and lysine decarboxylase negative together point to an enteric that uses the butanediol pathway, is able to move, and does not decarboxylate lysine. Among common lactose-fermenting enterics, only Enterobacter species are motile, and many Enterobacter strains are VP positive and LDC negative. Klebsiella species are nonmotile, which rules them out despite also being lactose fermenters and VP positive. Morganella morganii does not ferment lactose, and E. coli is typically VP negative. Therefore, the organism that best fits all four traits is Enterobacter cloacae.

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