Dan GrimmerThe Norfolk and Norwich University Hospital will remain closed to ward visitors this weekend due to a winter vomiting bug.Dan Grimmer

The Norfolk and Norwich University Hospital will remain closed to ward visitors this weekend due to a winter vomiting bug.

This restriction will be reviewed on Monday, but until then visitors are asked not to visit the hospital until 'absolutely necessary'.

The norovirus stomach bug causes nausea and diarrhoea and is very easily spread from person to person. The spread of infection is easiest in places where groups of people are in close proximity for reasonable amounts of time such as residential homes, schools, hospitals and workplaces.

The virus lasts about two days and no treatment is required, however even after the symptoms have cleared up, people may still carry the virus and infect others up to three days after their own symptoms have stopped.