Which organism is non-lactose fermenting, oxidase negative, and shows DNAse positivity?

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Multiple Choice

Which organism is non-lactose fermenting, oxidase negative, and shows DNAse positivity?

Identifying a non-lactose fermenting, oxidase-negative Gram-negative rod by its DNase activity. This combination points to Acinetobacter, because on MacConkey it appears as a non-lactose fermenter and it is oxidase negative. The DNase test then helps confirm, since Acinetobacter species classically show DNase positivity, distinguishing it from other non-lactose fermenting, oxidase-negative rivals in routine panels. Pasteurella multocida would not fit, as it is oxidase positive. The other oxidase-negative, non-lactose fermenters listed typically do not show DNase positivity in standard testing, so they don’t match this exact profile.

Identifying a non-lactose fermenting, oxidase-negative Gram-negative rod by its DNase activity. This combination points to Acinetobacter, because on MacConkey it appears as a non-lactose fermenter and it is oxidase negative. The DNase test then helps confirm, since Acinetobacter species classically show DNase positivity, distinguishing it from other non-lactose fermenting, oxidase-negative rivals in routine panels. Pasteurella multocida would not fit, as it is oxidase positive. The other oxidase-negative, non-lactose fermenters listed typically do not show DNase positivity in standard testing, so they don’t match this exact profile.

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