Stomach Flu February 2024. The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite. An infected person can transmit the virus for days after they’re feeling better.
Often wrongly called the “stomach flu,” norovirus sickens tens of millions of americans annually. Cases of norovirus — which is highly contagious and causes vomiting and diarrhea — are surging in the united states.