Which organism is associated with bacterial foodborne intoxication?

• A. Campylobacter
• B. Listeria monocytogenes
• C. Salmonella
• D. Staphylococcus aureus

Answer: (D)

Foodborne intoxication happens when people ingest toxins that were already produced in contaminated food, so the illness is caused by the toxin itself rather than ongoing infection by the organism. Staphylococcus aureus is a classic example because it can grow in foods and produce enterotoxins that are heat-stable, especially in high-protein foods left at room temperature. Ingesting these toxins can trigger rapid onset vomiting and abdominal cramps within a few hours. The other bacteria listed typically cause illness through infection: they must be consumed as live organisms that then invade or damage the intestinal tract, leading to gastroenteritis with symptoms that often take longer to develop.