“This year seems to be a banner year for norovirus occurring — there’s a lot of cases being reported,” said Dr. Michael Sweat, the director of the Center for Global Health at the Medical University of South Carolina. The virus is typically most prevalent from November to April, he added.

The main symptoms of norovirus include signs of gastroenteritis, Martinello says. A mild norovirus infection might just cause some loose stools and loss of appetite, Martinello says. But a more severe bout can come with a fever. And, with severe vomiting and diarrhea, dehydration is also often a worry.