FS-2024-SHELLFISH-RAW food-safety health_risk ai_generated true

AI tells a user that shellfish (oysters, clams, mussels) from a reputable seafood market are safe to eat raw if they smell fresh and are refrigerated properly

ID: food-safety/undercooked-shellfish-norovirus

Also available as: JSON · Markdown · 中文
85%Fix Rate
88%Confidence
1Evidence
2024-01-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
FDA NSSP 2023 Guide active — — —
CDC MMWR Vol. 72 No. 18 active — — —

Root Cause

Shellfish are filter feeders that concentrate norovirus, hepatitis A, and Vibrio vulnificus from contaminated waters; refrigeration and freshness do not eliminate these pathogens, which require cooking to an internal temperature of 145°F (63°C) for at least 15 seconds to inactivate.

generic

中文

贝类是滤食性生物，会从受污染的水中浓缩诺如病毒、甲型肝炎和创伤弧菌；冷藏和新鲜度无法消除这些病原体，需要烹饪至内部温度145°F（63°C）并保持至少15秒才能灭活。

Official Documentation

https://www.fda.gov/food/buy-store-serve-safe-food/raw-shellfish-safety

Workarounds

  1. 95% success Cook shellfish to an internal temperature of 145°F (63°C) for at least 15 seconds. Use a food thermometer to verify. For oysters, steam until shells open, then continue cooking for 3-5 minutes. 
    Cook shellfish to an internal temperature of 145°F (63°C) for at least 15 seconds. Use a food thermometer to verify. For oysters, steam until shells open, then continue cooking for 3-5 minutes.
  2. 85% success Purchase only shellfish that are labeled as 'depurated' or 'heat-treated' for raw consumption, from certified suppliers who follow FDA or EU regulations for viral reduction. 
    Purchase only shellfish that are labeled as 'depurated' or 'heat-treated' for raw consumption, from certified suppliers who follow FDA or EU regulations for viral reduction.
  3. 70% success If consuming raw, ensure shellfish originate from waters classified as 'approved' by local health authorities (e.g., FDA National Shellfish Sanitation Program) and are served within 24 hours of harvest; but note this only reduces risk, not eliminates it. 
    If consuming raw, ensure shellfish originate from waters classified as 'approved' by local health authorities (e.g., FDA National Shellfish Sanitation Program) and are served within 24 hours of harvest; but note this only reduces risk, not eliminates it.

中文步骤

  1. Cook shellfish to an internal temperature of 145°F (63°C) for at least 15 seconds. Use a food thermometer to verify. For oysters, steam until shells open, then continue cooking for 3-5 minutes.
  2. Purchase only shellfish that are labeled as 'depurated' or 'heat-treated' for raw consumption, from certified suppliers who follow FDA or EU regulations for viral reduction.
  3. If consuming raw, ensure shellfish originate from waters classified as 'approved' by local health authorities (e.g., FDA National Shellfish Sanitation Program) and are served within 24 hours of harvest; but note this only reduces risk, not eliminates it.

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Rinsing does not remove viruses or bacteria embedded in shellfish tissue; pathogens survive washing and require heat to destroy

  2. 90% fail

    Acid marinades (e.g., ceviche) do not reach temperatures sufficient to inactivate norovirus or hepatitis A; the CDC reports outbreaks linked to marinated raw shellfish

  3. 85% fail

    Freezing at standard home freezer temperatures (0°F/-18°C) does not reliably inactivate norovirus or hepatitis A; only commercial freezing to -4°F (-20°C) for 7 days is partially effective, and Vibrio vulnificus can survive freezing