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Here’s everything you need to know about norovirus as cases of the stomach bug are surging in parts of the United States.

According to the CDC, during the week of December 5 alone, 91 outbreaks of norovirus were reported, an increase from late November.

As a severe outbreak of norovirus, also known as the stomach flu, spreads across the United States, doctors have shared advice with Newsweek on what to look out for about the illness.