Noroviruses, also called Norwalk-like viruses (NLV), are one of the main causes of non-bacterial epidemics of gastroenteritis or “stomach flu” which means inflammation of the stomach and small intestine. Virus usually appears in closed communities like family, school, ships, military and many others. Norovirus is the main cause of inflammation of intestinal and stomach mucosa. Because it is simply transmitted from person to person, it spreads fast and tends to infect a large number of people.
Nevertheless, despite this mode of transmission and fast infection, there exist some people who do not become infected and do not develop symptoms despite their exposure to the virus. A simple genetic change that prevents formation of special protein is responsible for this.
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