人工智能告诉用户，如果盖了盘子，放在柜台上过夜的剩披萨早上吃是安全的
AI tells a user that leftover pizza left on the counter overnight is safe to eat in the morning if it was covered with a plate
ID: food-safety/leftover-pizza-counter-overnight
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| USDA-FSIS-2023 | active | — | — | — |
| FDA-Food-Code-2022 | active | — | — | — |
| CDC-Leftover-2023 | active | — | — | — |
根因分析
美国农业部（USDA）和美国食品药品监督管理局（FDA）的'2小时规则'适用于所有易腐食品，包括披萨；将披萨在室温下放置超过2小时允许金黄色葡萄球菌和蜡样芽孢杆菌生长，它们的毒素是热稳定的；盖盘子不会阻止细菌生长，因为它不会将温度降低到40°F以下，也不会创造抑制病原体的厌氧环境。
English
The USDA and FDA's '2-hour rule' applies to all perishable foods, including pizza; leaving pizza at room temperature for more than 2 hours allows Staphylococcus aureus and Bacillus cereus to grow, and their toxins are heat-stable; covering with a plate does not prevent bacterial growth because it does not lower the temperature below 40°F or create an anaerobic environment that inhibits pathogens.
官方文档
https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/leftovers-and-food-safety解决方案
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在烹饪后2小时内冷藏剩披萨；如果放置超过2小时，丢弃。储存时，将切片放入密封容器或用铝箔紧紧包裹，然后在40°F或以下冷藏。示例：'披萨送达后，设置1.5小时的计时器；时间到时，立即将剩余切片转移到拉链袋中，挤出空气，放入冰箱。'
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如果无法在2小时内冷藏（例如在派对上），将披萨放在预热的保温冷却器中（140°F或以上）保持热温，或使用保温盘。示例：'用热水预热干净的冷却器10分钟，倒掉水，将披萨盒放入，盖上盖子；披萨在140°F以上可保持长达4小时。'
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在带盖的平底锅中用中火重新加热冷藏的剩披萨3-4分钟，这可以恢复酥脆度并确保均匀加热至165°F。示例：'将切片放入不粘锅中，加入1汤匙水，盖上锅盖，中火加热3分钟；用探针温度计检查内部温度。'
无效尝试
常见但无效的做法:
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65% 失败
User thinks covering prevents contamination from airborne bacteria; covering does not slow bacterial growth on the pizza itself; pathogens already present multiply at room temperature regardless of cover.
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70% 失败
User believes reheating in microwave or oven kills all bacteria and toxins; Staphylococcus aureus enterotoxins are heat-stable and survive boiling (212°F) for 30 minutes; reheating to 165°F does not destroy them.
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55% 失败
User assumes pizza with low-moisture toppings (e.g., pepperoni, cheese only) is safe longer; but the cheese and sauce provide sufficient water activity (aw >0.95) for pathogen growth; dry toppings do not reduce overall risk.