The norovirus was previously known as the Norwalk-like virus, after a virus that was first identified in 1972 following an outbreak of G.I in Norwalk, Ohio. Norovirus is a collective name for a group of viruses that can affect the stomach and intestines. In some cases, these viruses can cause gastroenteritis, an inflammation of the stomach and the large intestines. While gastroenteritis is frequently known as a calicivirus infection or a form of food poisoning, it may not always be related to food. Norovirus is sometimes also called “stomach flu”, although it is not related to the ‘flu, or the 24-hour stomach bug’