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Norovirus / Winter vomiting bug / Norwalk agent / Norwalk virus / Small round structured viruses

Noroviruses are a group of viruses that are one of the most common stomach bugs in the UK and causes intestinal flu. This virus is transferred person to person via contaminated food or water. It is highly contagious and can affect people of all ages. Over 600,000 people in the UK catch Norovirus each year. This virus also contributes to 90% of Gastroenteritis around the world.


The initial signs of Norovirus is usually sudden feeling of sickness followed by vomiting and watery diarrhoea. The symptoms will start to appear 1 -2 days after infection; most people will fully recovery within a few days.

However in some cases symptoms may also include:

  • High temperature over 38C
  • Headaches
  • Stomach cramps
  • Aching limbs
  • This infection is not generally dangerous but the risk of dehydration is very high but there are no long-lasting effects from having Norovirus.


There actually is no specific cure to this virus but to let it run its course. To avoid dehydration it is vital to drink plenty of fluids to avoid dehydration to not spread the infection to others.

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This website contains general information about medical conditions and treatments. The information is not advice, and should not be treated as such. Please read our medical disclaimer.