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Fourteen people fall ill 1 to 5 hours after a staff lunch. All ate fried rice made from rice boiled the day before, left at room temperature overnight and briefly reheated. Most have nausea and vomiting, few have diarrhea, and none has fever. Leftover rice is cultured: mannitol egg yolk polymyxin (MYP) agar grows 10^7 CFU/g of pink colonies surrounded by a white precipitate. The isolate is a large, beta-hemolytic, motile gram-positive bacillus with central to subterminal spores that do not swell the cell. The illness is best explained by:
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