Which organism is associated with food poisoning due to preformed enterotoxins and is a common cause of foodborne illness?

• A. Escherichia coli
• B. Staphylococcus aureus
• C. Bacillus cereus
• D. Clostridium perfringens

Answer: (B)

Foodborne illness from preformed toxins happens when the toxin is already produced in the food before it’s eaten. Staphylococcus aureus is a classic example because it can grow in various foods and release enterotoxins while the food is being prepared or stored. These toxins are heat-stable, so normal cooking may not destroy them, and symptoms can appear very quickly—often within 1 to 6 hours—with sudden vomiting, nausea, abdominal cramps, and sometimes diarrhea. This makes Staphylococcus aureus a common cause of foodborne illness, especially in foods that are handled by people and kept at room temperature for too long, such as mayonnaise-based salads, dairy products, meats, and desserts.

Other organisms involve different mechanisms. For instance, some cause illness after the bacteria infect the gut or produce toxins in the intestine, rather than toxins that are already present in food. That’s why the scenario described best fits the preformed enterotoxin pattern associated with Staphylococcus aureus.