If there’s one thing you don’t want to endure, it’s the symptoms of norovirus, a brutal stomach bug that tends to cause relentless diarrhea and vomiting for roughly one to three hellish days. And it may be especially difficult to avoid right now,

Norovirus cases are surging in the US, the CDC says. Here are the symptoms to look for, plus how long you're contagious for, per an infectious disease doctor.