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