Which organism is not listed among the five common foodborne illnesses described?

• A. Salmonella
• B. Shigella
• C. Norovirus
• D. Listeria

Answer: (D)

This question tests recall of which pathogens are typically listed as the five most common causes of foodborne illness. In standard food safety materials, organisms like Salmonella, Shigella, and Norovirus appear among those commonly described due to their high incidence and broad range of implicated foods. Listeria, while very important and high-risk—especially for pregnant women and older adults—does not usually sit in that top-five list. That’s why Listeria is the best choice here: it’s not among the five common illnesses described in that context, even though it remains a critical pathogen to monitor and prevent.