A nasty, highly contagious virus is spreading across the country ahead of the holiday season — and it’s not the flu or Covid .

Norovirus, also called the “ winter vomiting disease ,” has been rising across the nation since as early as mid-October, especially in states like Louisiana, Michigan and Indiana, according to data from WastewaterSCAN , an academic program through Stanford University in partnership with Emory University.

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With data through Nov. 21, Amanda Bidwell, scientific program manager for the WastewaterSCAN program, said norovirus wastewater concentrations have increased nationwide by 69% since October.

“Right now, we’re in the high category for norovirus at the national level,” she said. Rates

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