Noroviruses are a group of viruses that cause stomach or intestinal infection, leading to vomiting and diarrhoea. Norovirus is highly infectious and spreads easily from person to person. Both faeces (poos) and vomit are infectious, and the virus can survive on contaminated surfaces even after cleaning with some disinfectants.
People with norovirus are infectious for at least 3 days after the symptoms stop and on some occasions for up to 2 weeks.
Norovirus can be spread in many ways: