What is the typical clinical onset for Staphylococcus aureus food poisoning and which toxin mediates it?

• A. Delated onset fever and diarrhea; exotoxin B
• B. Jaundice; enterotoxin A
• C. Neurologic symptoms; alpha-toxin
• D. Rapid onset vomiting within 1-6 hours; mediated by preformed heat-stable enterotoxins (SEA, SED, etc.)

Answer: (D)

Staphylococcus aureus food poisoning comes from toxins that are already produced in contaminated food before you eat it. These enterotoxins are heat-stable, so cooking may not destroy them, and they act quickly once ingested. The key clinical clue is a rapid onset of vomiting, typically within about 1 to 6 hours after a meal, often with abdominal cramps and sometimes diarrhea, but fever is usually absent. The toxins involved include preformed enterotoxins such as SEA and SED, among others, which stimulate the gut and vomiting center. This combination—rapid vomiting after a short incubation and toxins that survive heating—best fits the described option.