Outbreaks of the highly contagious stomach virus are more than double what they were last year at the time, CDC says. Protect yourself by washing hands with soap often — antibacterial gel doesn't work well against the virus.

Below we share the causes, signs and preventive tips for norovirus. By following these tips, you can significantly reduce the risk of contracting or spreading norovirus.

A sharp increase in norovirus cases is sweeping the United States, according to the latest data from the Centers for Disease Control and Prevention (CDC). Often called the "stomach flu," norovirus is a leading cause of gastroenteritis,

There were 91 outbreaks reported during a week in December — more than double what was seen in previous years, the CDC says.

According to CDC metrics through early December, outbreaks of the virus, which causes gastroenteritis, are on the rise.

The number of national norovirus outbreaks was the highest seen in December since at least 2012. Experts suggest increased hand-washing to avoid catching the ultra-contagious stomach bug.