Ireland – Guidance on Management of Norovirus for Shellfish Producers

SFPA

Introduction:
Norovirus (NoV), commonly known as the “winter vomiting bug”, is a significant cause of acute gastroenteritis often causing diarrhoea and vomiting. The virus is transmitted through the consumption of food or water contaminated with faecal matter or through contact with infected individuals or surfaces. It is prevalent in the community and can be present in discharges from even advanced wastewater treatment systems, which may not entirely eliminate NoV.
Bivalve molluscs such as oysters are known to accumulate and concentrate NoV. This poses a particular health risk as these shellfish are often consumed raw or lightly cooked, making them a potential source of infection.