Which pathogens are most commonly associated with foodborne illness?

• A. Hepatitis A and Norovirus.
• B. E. coli O157:H7 and Salmonella
• C. Listeria and Campylobacter
• D. Clostridium botulinum and Vibrio

Answer: (A)

Foodborne illness is most often driven by pathogens that spread easily through contaminated food, especially via the fecal-oral route. Norovirus stands out as the leading cause of gastroenteritis outbreaks linked to food because it requires only a tiny infectious dose and remains stable in the food chain and on surfaces; outbreaks frequently occur in food-service settings when an infected person handles prepared foods. Hepatitis A is another well-known foodborne virus transmitted in the same way, often tied to contaminated foods or infected food handlers and certain shellfish.

Together, these two pathogens account for a large share of common foodborne illness events observed in practice, which is why they are considered the most commonly associated with foodborne illness. The other options involve important bacteria or toxins, but they typically cause outbreaks or illnesses that are less representative of the everyday, widespread pattern seen with norovirus and Hepatitis A.