In 2004, the United Kingdom faced a critical health concern due to contaminated shellfish, specifically oysters, tainted with norovirus. This led to multiple foodborne illness outbreaks, with symptoms including vomiting and diarrhea. Investigations identified pollution in coastal waters as the likely source of contamination. This incident highlighted the importance of improved sanitation and stricter monitoring of shellfish harvesting to ensure seafood safety, resulting in health advisories and policy changes.