A patient develops watery diarrhea after consuming contaminated seafood during a trip abroad. Stool culture reveals Gram-negative, comma-shaped rods that are highly motile and grow well in alkaline media. Which organism is the most likely cause?

The correct answer to the question "A patient develops watery diarrhea after consuming contaminated seafood during a trip abroad. Stool culture reveals Gram-negative, comma-shaped rods that are highly motile and grow well in alkaline media. Which organism is the most likely cause?" is Option C: Vibrio cholerae.

The other options — A) Campylobacter jejuni, B) Salmonella typhi, D) Shigella dysenteriae — are incorrect for this USMLE Exam Prep question. As explained above: Vibrio cholerae is a Gram-negative, comma-shaped rod that causes watery diarrhea. It is highly motile and grows optimally in alkaline conditions, commonly associated with contaminated seafood or wate…