When someone in your household tests positive for COVID-19, a few straightforward steps can significantly lower the chance of spreading it to everyone else. The sick person should isolate in a separate room, and the rest of the household should test five full days after exposure. Here’s a practical walkthrough of what to do right now and over the coming days.
Isolate the Sick Person
The single most effective thing you can do is give the person who tested positive their own room with the door closed. Ideally, they’d also have their own bathroom. If a separate bathroom isn’t possible, have the sick person wear a mask when using shared spaces, and wait as long as practical before the next person goes in. Open a window or run the exhaust fan to clear the air.
The CDC recommends that someone with COVID stay away from others until at least 24 hours after both of the following are true: their symptoms are improving overall, and they haven’t had a fever without using fever-reducing medication. After that point, they should still take extra precautions for five more days, including wearing a mask around others, keeping physical distance, and improving airflow in shared spaces.
Improve Airflow Throughout the House
COVID spreads primarily through the air, so ventilation is your best friend. Open windows in common areas and the sick person’s room whenever weather allows. The CDC recommends aiming for five air changes per hour in indoor spaces to meaningfully reduce the concentration of viral particles. You won’t hit that number with windows alone in most homes, but every bit helps.
A portable HEPA air purifier in the sick person’s room and in shared spaces makes a real difference. Choose one rated for the square footage of the room. If you have a central HVAC system, set the fan to run continuously rather than on “auto” so it filters air even when the system isn’t heating or cooling. Upgrading to a higher-rated furnace filter (MERV 13 if your system can handle it) adds another layer of protection.
Wear Masks Inside the House
This feels strange at home, but masking indoors is one of the most practical tools you have. An N95 or KF94 respirator provides far better protection than a cloth or surgical mask. Anyone entering the sick person’s room, delivering food, or spending time in a shared space should wear one. The sick person should mask up any time they leave their room, even briefly.
When and How to Test
If you’ve been exposed but don’t have symptoms, don’t test immediately. The FDA recommends waiting at least five full days after your last exposure before using a home rapid test. Testing too early often produces a false negative because the virus hasn’t replicated enough to be detectable yet.
If you develop symptoms before those five days are up, test right away. A positive result means you should follow the same isolation steps. A negative result when you have symptoms is worth repeating: take a second test 48 hours later to be sure. Keep in mind that living with someone who’s positive means your exposure is ongoing until they’re no longer isolating, so you may need to test more than once.
Getting Treatment Early
Antiviral treatment works best when started as soon as possible. The most commonly prescribed oral antiviral, Paxlovid, must be started within five days of symptom onset. A second option, molnupiravir, has the same five-day window. For people who can’t take oral medications, an intravenous antiviral (remdesivir) can be started within seven days of symptoms.
These medications are most important for people at higher risk of severe illness: adults over 65, anyone with chronic conditions like diabetes, heart disease, or lung disease, people who are immunocompromised, and those who are pregnant. If the person who tested positive falls into any of these groups, contact a doctor or telehealth provider the same day symptoms start. The clock on treatment is tight, and every day of delay reduces effectiveness.
Household members who are high-risk and haven’t yet tested positive should also have a plan ready. Talk to a doctor now about getting a prescription on standby so you can start treatment quickly if you do develop symptoms.
Monitor for Warning Signs
Most people recover at home without complications, but it’s important to watch for signs that the illness is getting worse. A pulse oximeter, the small clip-on device that reads blood oxygen through a fingertip, is a useful tool to have on hand. Normal oxygen saturation is 95% or above. If readings drop below 90%, that requires immediate medical attention, according to the World Health Organization.
Other warning signs that need urgent care include difficulty breathing or shortness of breath at rest, persistent chest pain or pressure, confusion or difficulty staying awake, and lips or face turning bluish. These symptoms can develop suddenly, sometimes around days 5 through 10 of illness, so continue checking in on the sick person even if they seemed to be improving.
Handling Meals, Laundry, and Shared Surfaces
Deliver meals to the sick person’s door so they can eat in their room. Use separate dishes and utensils, or disposable ones. Regular dishwashing with soap and hot water is sufficient to clean anything they’ve used.
For laundry, use the warmest appropriate water setting for the fabric and dry items completely. You don’t need to wash the sick person’s clothes or bedding separately from everyone else’s. Do wash your hands after handling their dirty laundry, and clean the hamper or basket with a household disinfectant.
Wipe down high-touch surfaces in shared spaces daily: door handles, light switches, faucet handles, toilet flush levers, and countertops. Standard household disinfectants or soap and water are effective. The person who’s cleaning should wear a mask while doing so, especially in the sick person’s room.
Protecting High-Risk Household Members
If anyone in the home is elderly, immunocompromised, pregnant, or has a chronic health condition, take extra steps to keep distance between them and the sick person. Ideally, the high-risk person should stay in a different part of the house and avoid any shared spaces when the sick person has recently been in them.
Consider having the high-risk household member stay elsewhere temporarily if that’s an option. If it’s not, prioritize masking (N95 or KF94 for the high-risk person), run an air purifier in their bedroom, and keep windows open in hallways or common areas. Make sure they know the five-day testing timeline and have a plan to start antiviral treatment quickly if they develop symptoms.
How Long to Keep These Precautions
Maintain full isolation and household precautions until the sick person meets the criteria to leave isolation: 24 fever-free hours without medication, plus overall improving symptoms. After that, keep the extra precautions going for five more days. That means continued masking in shared spaces, physical distance, and good ventilation.
For the rest of the household, the risk window extends beyond the sick person’s recovery. Since your last exposure may have been one of the final days of their isolation, count five days from that point before testing. If everyone tests negative and has no symptoms, you can return to normal routines.