Noroviruses are one of the most common causes of gastroenteritis (stomach bugs). In the past, noroviruses have also been called 'winter vomiting viruses', 'small round structured viruses' or 'Norwalk-like viruses'. They belong to a group of viruses called 'caliciviruses'.

Number of norovirus outbreaks, norovirus outbreak associated cases and norovirus notifications in Ireland by season 2017-2021


Noroviral infection in Ireland:

440 The number of norovirus notifications in 2021
9.2 The national norovirus case notification rate per 100,000 population in 2021

Last updated: 29 April 2022