A fast-moving stomach bug is spreading as the holiday season gets underway, according to new data from the Centers for Disease Control and Prevention.

Norovirus can be a nasty bug — it inflames the stomach and intestines. It’s the leading cause of vomiting, diarrhea, and foodborne illness in the U.S.

As of mid-November, nearly 14% of tests were coming back positive for norovirus. That’s more than double what we saw three months ago, when positivity was about 6%.

This data comes from the CDC, which collects reports from labs, hospitals and health departments across the country. Cases of fast-moving stomach bug norovirus rise across U.S.

But it’s not just the CDC seeing this trend. Data from WastewaterSCAN shows norovirus is rising across the US, especially in states like Louisiana, Ind

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