Stomach Bug 2024 Map Uk. Norovirus is the most common cause of gastroenteritis worldwide. The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite.
Norovirus, commonly known as the winter vomiting bug (although it can strike at any time of year), is a stomach bug that causes sickness and diarrhoea. Norovirus is the most common cause of gastroenteritis worldwide.