* a 20-year-old man became sick after eating a meal of leftovers of spaghetti with tomato sauce, which had been prepared 5 days before and left in the kitchen a

* a 20-year-old man became sick after eating a meal of leftovers of spaghetti with tomato sauce, which had been prepared 5 days before and left in the kitchen at room temperature.* Srsly? 5-day old leftovers, what a lack of life skills. Ordinarily you encounter B. cereus poisining with rice leftovers. Rice grains are contaminated with B. cereus spores, which germinate after cooking, and unfortunately the microorganism grows even at refrigerator temperatures, and you don't notice the spoilage, it doesn't give a funny taste immediately. 24-hour-old rice is still fine, anything older, and it's really asking for it.