Norovirus is a viral infection that causes inflammation of the stomach or intestines. It is the most common cause of acute gastroenteritis in the United States, according to the Centers for Disease Control and Prevention.
Norovirus often is confused with the flu, but the two are not related.
Norovirus is highly contagious and can be acquired from an infected person, contaminated food or water or by touching contaminated surfaces.
If you have norovirus, you should drink lots of liquids to replace lost fluids and ensure that you don't become dehydrated. Because it is a virus and not a bacterial infection, it shouldn't be treated with antibiotics. People with severe symptoms might need to go to the hospital for intravenous fluids to keep them hydrated.