How do I deal with norovirus going around?

A lot of my classmates feel sick. One had cramps but it passed. The second had to go home cuz he felt sick. That was yesterday. Today a third classmate feels like she’s gonna throw up but she doesn’t wanna go home. I only talk to one person in class so I’m not close to the rest of them but I still feel scared. I don’t want to be around them. I know the only thing I can do is wash my hands etc but I feel like that’s not enough. Maybe that’s why I’ve been having cramps these past two days. It can’t be anxiety since I didn’t make this connection til now