Acinetobacter baumannii has which characteristic?

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Prepare for the Clinical Laboratory Science Microbiology Test with engaging content and multiple choice questions. Each question is accompanied by hints and detailed explanations to enhance your learning experience and boost your confidence for the examination!

Multiple Choice

Acinetobacter baumannii has which characteristic?

Explanation:
Acinetobacter baumannii is oxidase negative, meaning it lacks the enzyme cytochrome c oxidase and gives a negative oxidase test. This negative result helps distinguish it from oxidase-positive organisms like Pseudomonas. It is a nonfermenter that can grow on MacConkey agar as pale, non-lactose-fermenting colonies, so the statement about not growing on MacConkey is incorrect. It does not ferment glucose, which fits its nonfermenter status, and cysteine isn’t a defining requirement. The oxidase-negative trait is the most characteristic feature distinguishing this organism.

Acinetobacter baumannii is oxidase negative, meaning it lacks the enzyme cytochrome c oxidase and gives a negative oxidase test. This negative result helps distinguish it from oxidase-positive organisms like Pseudomonas. It is a nonfermenter that can grow on MacConkey agar as pale, non-lactose-fermenting colonies, so the statement about not growing on MacConkey is incorrect. It does not ferment glucose, which fits its nonfermenter status, and cysteine isn’t a defining requirement. The oxidase-negative trait is the most characteristic feature distinguishing this organism.

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