Which Vibrio species on TCBS agar does not ferment sucrose?

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Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Multiple Choice

Which Vibrio species on TCBS agar does not ferment sucrose?

Explanation:
On TCBS agar, differentiation hinges on sucrose fermentation. The medium uses sucrose and a pH indicator; when an organism ferments sucrose, acid is produced and the colony turns yellow. If the organism cannot ferment sucrose, no acid is produced and the colony remains green. Vibrio parahaemolyticus is the non-sucrose fermenter among these options, so its colonies stay green on TCBS. The others listed typically ferment sucrose, producing yellow colonies, and thus would not be the non-sucrose fermenter.

On TCBS agar, differentiation hinges on sucrose fermentation. The medium uses sucrose and a pH indicator; when an organism ferments sucrose, acid is produced and the colony turns yellow. If the organism cannot ferment sucrose, no acid is produced and the colony remains green.

Vibrio parahaemolyticus is the non-sucrose fermenter among these options, so its colonies stay green on TCBS. The others listed typically ferment sucrose, producing yellow colonies, and thus would not be the non-sucrose fermenter.

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