The basics

Separation If you are potentially infectious, it is important that you separate yourself from your partner, your housemates, your children, your elderly aunt. To be on the safe side, you shouldn’t even pet your dog, according to the C.D.C., although pets are not known to transmit the coronavirus.

A room must be designated for your exclusive use. A bathroom should be, too, if possible. Every surface you cough on or touch could become contaminated with the virus.

You should have no visitors, and keep three to six feet away from others. Don’t take the bus or subway, or even a taxi.

Masks If you must be around other people — in your home, or in a car, because you’re on your way to see a doctor (only after you have called) — you should wear a mask, and everyone else should, too.

But first, you or one of your friends or family members have to find masks, which are sold out almost everywhere. If you can’t, you can create a makeshift one from a scarf or other garment.

Hygiene If you cough or sneeze, you should cover your mouth and nose with a tissue, and discard the used tissue in a lined trash can. Then you must immediately wash your hands with soap and water for at least 20 seconds.