Thankfully, this is not my dilemma! But it's something I've wondered about because I'm sure there are a lot of people in this situation. I read a post on a real estate investing forum I frequent, where the poster is renting out a room out of their personal home. Their area is under a Stay At Home order, but their roommate is constantly having a variety of friends over.
They have repeatedly asked their roommate to stop having people over so much because it is putting both of their health at risk. But the roommate is refusing to comply and says they can't tell them they can't have company. WWYD? (I have no intention of posting anyone's reply, I just thought this would be an interesting discussion).
It's such a tricky situation because how do you control an irresponsible roommate's dangerous behavior. Possibly moving out themselves but, in this situation, it's the poster's own house! They can post a "Cease and Desist" notice. But it's not going to have any teeth until evictions are allowed again.
I think what I would do is sequester myself in my room as much as possible. Wear a mask and gloves when I am in common areas. Wipe down kitchen counters, appliances, door knobs, etc. with disinfectant between "guests". I mean, yeeesh, what a PITA!!! Once the crisis is over, I would also give the roommate a 30-Day Notice to Vacate. Because someone who doesn't respect my reasonable house rules is not a roommmate I want.