Which Vibrio species is typically associated with seafood and gastroenteritis after eating raw or undercooked shellfish?

• A. Vibrio alginolyticus
• B. Vibrio cholerae
• C. Vibrio parahaemolyticus
• D. Vibrio vulnificus

Answer: (C)

Vibrio parahaemolyticus is the Vibrio species most commonly linked to gastroenteritis from seafood, especially when shellfish like raw oysters are eaten. It lives in marine environments and tends to accumulate in shellfish, so consuming these foods can lead to symptoms such as watery diarrhea, abdominal cramps, nausea, and vomiting within a short time after ingestion. This pattern fits the scenario of gastroenteritis after eating raw or undercooked shellfish.

Vibrio cholerae causes cholera, marked by profuse watery diarrhea from contaminated water or foods, not the typical shellfish-related gastroenteritis described. Vibrio vulnificus is known for severe wound infections and septicemia, particularly in people with liver disease, and while it can cause gastroenteritis, it is not the usual mild, self-limited seafood-linked illness. Vibrio alginolyticus can cause various infections but is a less common cause of shellfish-associated gastroenteritis.

So the best fit for seafood-associated gastroenteritis after eating raw or undercooked shellfish is Vibrio parahaemolyticus.