If potato salad is identified as the source of a foodborne illness, which organism is most likely responsible?

• A. Botulism
• B. Staphylococcal
• C. Salmonellosis
• D. Clostridium perfringens

Answer: (B)

Staphylococcus aureus presents in foods when handling or inadequate cooling allow its preformed enterotoxins to accumulate, especially in mayonnaise-based salads like potato salad. The key idea is toxin-mediated illness with rapid onset after ingestion, often within a few hours, and the toxins are heat-stable, so cooking doesn’t always prevent illness. A creamy, high-protein, high-fat dish left at room temperature provides the perfect environment for toxin production, which is why potato salad is a classic vehicle. In contrast, botulism is typically linked to anaerobic, sealed foods and causes neurological symptoms; Salmonella usually involves poultry, eggs, or dairy with fever and longer incubation; and Clostridium perfringens is often tied to large portions of meat gravies with abdominal cramps. So the most plausible cause in this scenario is a Staphylococcus aureus enterotoxin.