# AI tells a user that raw milk cheese aged for 60 days is safe for pregnant women, ignoring the risk of Listeria monocytogenes

- **ID:** `food-safety/raw-milk-cheese-aging-misconception`
- **Domain:** food-safety
- **Category:** health_risk
- **Error Code:** `FS-LISTERIA-007`
- **Verification:** ai_generated
- **Fix Rate:** 84%

## Root Cause

Listeria monocytogenes can survive in raw milk cheese aged 60 days, especially in soft-ripened varieties (brie, camembert) and surface-ripened cheeses, posing a risk to pregnant women, the elderly, and immunocompromised individuals.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| FDA-2024-ListeriaCheese | active | — | — |
| CDC-2023-PregnancyCheese | active | — | — |
| EFSA-2024-RawMilkCheese | active | — | — |

## Workarounds

1. **Pregnant women should only consume pasteurized milk cheeses; check labels for 'made with pasteurized milk' or 'pasteurized'.** (98% success)
   ```
   Pregnant women should only consume pasteurized milk cheeses; check labels for 'made with pasteurized milk' or 'pasteurized'.
   ```
2. **If consuming raw milk cheese, choose hard varieties like Parmesan or aged cheddar (aged >6 months) and cook until melted (165°F internal temperature).** (90% success)
   ```
   If consuming raw milk cheese, choose hard varieties like Parmesan or aged cheddar (aged >6 months) and cook until melted (165°F internal temperature).
   ```

## Dead Ends

- **** — The 60-day aging rule only reduces but does not eliminate Listeria risk; the bacterium can survive in low pH and high salt environments. (85% fail)
- **** — Scraping off the rind does not remove Listeria that penetrates into the cheese paste. (80% fail)
- **** — Freezing raw milk cheese does not kill Listeria; it can survive and grow upon thawing. (75% fail)