Norovirus is now the biggest cause of severe tummy troubles in young kids. Researchers at the Centers for Disease Control say they found that Norovirus was the culprit in 21 percent of the cases they reviewed, while Rotavirus was found in 12 percent. Doctors say this indicates the Rotavirus vaccine is effective. Norovirus is highly contagious and is spread through close contact with sick people and contaminated food.

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CDC: Norovirus now the leading cause of severe gastroenteritis in U.S. children

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