What Is Norovirus?
By Marc Lallanilla and Rachael Rettner | September 22, 2017 04:48pm ET
Norovirus is a very contagious virus that causes gastrointestinal illness in humans. It is the most common cause of illnesses from contaminated food in the United States — an estimated 20 million Americans get sick with the virus each year, according to the Centers for Disease Control and Prevention (CDC), and it is blamed for as many as 800 deaths in the United States each year.
Norovirus is named for Norwalk, Ohio, where the first confirmed outbreak was recorded, in 1968. People sometimes refer to a norovirus infection as "stomach flu," even though the virus is not related to influenza.
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