Which bacterium causes rapid vomiting-type food poisoning due to a heat-stable enterotoxin, with typical foods including pork, ham, custard, and cream desserts?

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Rapid onset vomiting from a heat-stable enterotoxin in foods points to Staphylococcus aureus. This bacterium can form preformed toxins in foods such as pork, ham, custard, and cream desserts, especially when dishes sit at room temperature. These toxins withstand normal cooking, so even reheated dishes can cause illness. The vomiting is typically rapid—often within 30 minutes to a few hours—and may be accompanied by nausea and abdominal cramps. Other organisms listed cause different symptoms or are linked to other foods (for example, Bacillus cereus is often linked to rice; Clostridium perfringens to diarrhea and cramps in meat gravies; Vibrio parahaemolyticus to seafood), making Staphylococcus aureus the best match for this description.