Which organism is most commonly linked to gastroenteritis and is associated with Campylobacter infections?

• A. Vibrio vulnificus
• B. Salmonella Typhi
• C. Campylobacter jejuni
• D. Escherichia coli O157:H7

Answer: (C)

Campylobacter jejuni is the organism most commonly linked to gastroenteritis and is the classic agent behind Campylobacter infections. It is a leading cause of bacterial diarrhea worldwide, usually acquired from undercooked poultry, unpasteurized milk, or contaminated water. Clinically, it causes diarrhea that can be watery or bloody, with abdominal cramps and fever, typically resolving within a week. In the lab, it’s a curved Gram-negative rod that grows best under microaerophilic conditions and at around 42°C, a distinctive feature that helps identify it. The other organisms listed cause different disease patterns: Vibrio vulnificus is often associated with seafood-related wound infections and gastroenteritis but is not the most common cause of general gastroenteritis; Salmonella Typhi leads to typhoid fever with systemic illness; and Escherichia coli O157:H7, while a major cause of hemorrhagic gastroenteritis, is not the Campylobacter-related infection.