Which organism is non-lactose fermenting, oxidase negative, nitrate positive, PAD positive, citrate negative, and indole positive?

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Multiple Choice

Which organism is non-lactose fermenting, oxidase negative, nitrate positive, PAD positive, citrate negative, and indole positive?

Biochemical profiling to identify enteric bacteria relies on patterns of metabolism and enzyme activities. This organism does not ferment lactose, is oxidase negative, reduces nitrate, has phenylalanine deaminase (PAD) activity, cannot utilize citrate, and produces indole. That combination aligns with Morganella morganii: PAD positivity places it with the PPM group (Proteus, Providencia, Morganella), citrate negativity helps distinguish it from citrate‑positive relatives, and indole production confirms tryptophanase activity typical for Morganella. In short, this specific pattern is most consistent with Morganella morganii among common non‑lactose‑fermenting Enterobacterales.

Biochemical profiling to identify enteric bacteria relies on patterns of metabolism and enzyme activities. This organism does not ferment lactose, is oxidase negative, reduces nitrate, has phenylalanine deaminase (PAD) activity, cannot utilize citrate, and produces indole. That combination aligns with Morganella morganii: PAD positivity places it with the PPM group (Proteus, Providencia, Morganella), citrate negativity helps distinguish it from citrate‑positive relatives, and indole production confirms tryptophanase activity typical for Morganella. In short, this specific pattern is most consistent with Morganella morganii among common non‑lactose‑fermenting Enterobacterales.

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