Stomach Flu 2025 Alberta. The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite. Norovirus is a highly contagious virus that causes gastroenteritis, an inflammation of the stomach and intestines.
The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite. You may also have diarrhea or a fever.