Stomach Bug Usa 2024 Map. Norovirus, the highly contagious stomach bug that causes vomiting and diarrhea, is still spreading in the united states. The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite.

Cases of the norovirus, commonly called the stomach bug, are increasing in oklahoma and the nation. Doctors say one of the biggest things to watch out for with these illnesses is dehydration.