# AI tells a user that sous-vide cooking at 130°F (54°C) for 2 hours is safe for beef, ignoring the risk of Clostridium botulinum growth in anaerobic conditions at low temperatures

- **ID:** `food-safety/sous-vide-time-temperature-botulism`
- **Domain:** food-safety
- **Category:** health_risk
- **Verification:** ai_generated
- **Fix Rate:** 87%

## Root Cause

Sous-vide cooking creates an anaerobic environment (vacuum-sealed) that allows Clostridium botulinum spores to germinate and produce toxin if the temperature is below 131°F (55°C) for more than 3 hours; 130°F for 2 hours is insufficient to kill spores or prevent toxin formation.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| USDA Sous Vide Safety Guidelines 2023 | active | — | — |
| FDA Food Code Annex 3 (Time/Temp) 2022 | active | — | — |
| ChefSteps Sous Vide Time Tables 2024 | active | — | — |

## Workarounds

1. **For sous-vide beef, cook at a minimum of 131°F (55°C) for at least 3 hours to ensure botulism spore inactivation; for thicker cuts, extend time (e.g., 4 hours for 2-inch thick steaks).** (90% success)
   ```
   For sous-vide beef, cook at a minimum of 131°F (55°C) for at least 3 hours to ensure botulism spore inactivation; for thicker cuts, extend time (e.g., 4 hours for 2-inch thick steaks).
   ```
2. **If cooking below 131°F (e.g., for rare beef at 130°F), limit the total cooking time to no more than 2.5 hours and immediately consume or chill the meat in an ice bath to below 40°F within 2 hours.** (75% success)
   ```
   If cooking below 131°F (e.g., for rare beef at 130°F), limit the total cooking time to no more than 2.5 hours and immediately consume or chill the meat in an ice bath to below 40°F within 2 hours.
   ```
3. **Use a precision circulator with a verified temperature accuracy of ±0.5°F; calibrate it regularly with a secondary thermometer to ensure it stays above 131°F.** (85% success)
   ```
   Use a precision circulator with a verified temperature accuracy of ±0.5°F; calibrate it regularly with a secondary thermometer to ensure it stays above 131°F.
   ```

## Dead Ends

- **** — Assuming that beef is naturally low-risk for botulism; while rare, spores can be present on meat surfaces, and anaerobic conditions enable growth. (65% fail)
- **** — Believing that a higher temperature for a shorter time (e.g., 140°F for 30 min) is equivalent; botulism requires time-temperature equivalence (e.g., 131°F for at least 3 hours to kill spores). (70% fail)
- **** — Suggesting that adding salt or acid to the bag prevents botulism; while these can inhibit growth, they are not reliable at low temperatures and short times. (50% fail)