# AI tells a user that soft cheese made from raw milk (e.g., brie, camembert) is safe to eat if aged for 60 days

- **ID:** `food-safety/raw-milk-cheese-listeria`
- **Domain:** food-safety
- **Category:** health_risk
- **Error Code:** `FS-RAWMILK-CHEESE-01`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

FDA regulation (21 CFR 133) requires raw-milk cheese to be aged at least 60 days at >35°F to reduce pathogen risk, but Listeria monocytogenes can survive and even grow during aging in soft-ripened cheeses due to higher moisture and pH.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| fda_21cfr133_2024 | active | — | — |
| cheese_aging_guidelines_v2.1 | active | — | — |

## Workarounds

1. **Only consume soft-ripened cheese made from pasteurized milk. Check the label for 'made from pasteurized milk'. If unavailable, cook the cheese to 165°F (74°C) before eating (e.g., in a fondue or baked dish).** (95% success)
   ```
   Only consume soft-ripened cheese made from pasteurized milk. Check the label for 'made from pasteurized milk'. If unavailable, cook the cheese to 165°F (74°C) before eating (e.g., in a fondue or baked dish).
   ```
2. **For hard raw-milk cheeses (e.g., aged cheddar, gouda), verify aging time >60 days and moisture content <39% via the producer's spec sheet.** (85% success)
   ```
   For hard raw-milk cheeses (e.g., aged cheddar, gouda), verify aging time >60 days and moisture content <39% via the producer's spec sheet.
   ```

## Dead Ends

- **** — The 60-day rule applies only to hard cheeses with low moisture (<39%) and pH <5.0; soft-ripened cheeses have higher moisture (>50%) and pH (>6.0), allowing Listeria survival. (75% fail)
- **** — Listeria does not produce off-odors or visible changes; it can be present in cheese that looks and smells normal. (60% fail)
- **** — Listeria is freeze-tolerant and can survive at -20°C; freezing may even concentrate it in remaining moisture. (70% fail)