As a virulent gastric bug affects more than 100,000 a week, the Health Protection Agency explains what it is
What are noroviruses?
Noroviruses are a group of viruses that are the most common cause of gastroenteritis (stomach bugs) in England and Wales. In the past, noroviruses have also been called “winter vomiting viruses”, “small round structured viruses” or “Norwalk-like viruses”.
How does norovirus spread?
The virus is easily transmitted from one person to another. It can be transmitted by contact with an infected person; by consuming contaminated food or water or by contact with contaminated surfaces or objects.
What are the symptoms?
The symptoms of norovirus infection will begin around 12 to 48 hours after a person becomes infected.