What is norovirus?published at 14:45 Greenwich Mean Time 20 March 2017
Earlier we told you of a deep-clean operation at a Norwich school following an outbreak of norovirus - but what is this sickness bug?
David Edwards, from Public Health England, external , says it's the most common stomach bug in the UK, highly contagious and affects people of all ages.
- It's also known as the winter vomiting bug
- Transmittable from person to person contact, or contact with contaminated surfaces or consumption of contaminated food
- Has distinct symptons - the sudden onset of nausea, projectile vomiting and diarrhoea
- A short incubation period - about 24 hours from infection to becoming ill
- There's no treatment - just rest and recover

It's important to wash your hands thoroughly with soap and water after using the loo or preparing food if you have been ill - Mr Edwards advises against using hand alcohol gels as they don't work with the virus.
- Stay off work or school, and don't visit health care centres
- Most people recover after 1-2 days
- Maintain fluid intake, especially in the young or elderly
- Soft furnishings and linen should be cleaned in a hot wash and surfaces cleaned with an agent containing bleach
It seems that we hear quite regularly of outbreaks of the virus, but is it more prevalent nowadays? Mr Edwards says norovirus was only identified a few decades ago, and the understanding of the bug has improved significantly.
Visit NHS Choices' norovirus pages, external .
Quote MessagePeople may have had it 30 years ago, but there were no tests to isolate it. It's been well-documented in the last 10 years and has been recognised as spreading very easily, which is why people are advised to stay off work, school or public places for 48 hours after they've stopped being ill."
David Edwards, Public Health England