You should stay home until your symptoms have been improving and you’ve been fever-free for at least 24 hours without using fever-reducing medication like acetaminophen or ibuprofen. For most people with mild illness, this means roughly two to five days at home, though the exact timeline depends on how quickly your body recovers. After that, you should wear a mask around others for five more days as an extra precaution.
The Current Isolation Rule
The CDC updated its COVID isolation guidance in 2024, moving away from a fixed five-day isolation period and aligning COVID with the same approach used for flu and other respiratory infections. The rule is now symptom-based rather than calendar-based: stay home until you meet two criteria at the same time.
- Your symptoms are clearly improving. You’re feeling better overall, coughing less, and have more energy.
- You’ve been fever-free for at least 24 hours without taking any fever-reducing medication.
Once both of those are true, you can leave the house. But for the next five days, wear a well-fitting mask in indoor public spaces and try to limit close contact with others, especially anyone at higher risk for severe illness. This five-day masking window exists because you can still shed virus even after you feel better.
How to Count the Days
If you have symptoms, day zero is the day your symptoms first appeared. The next full day after that is day one. So if you wake up with a sore throat on Monday, Monday is day zero and Tuesday is day one.
If you tested positive but never develop symptoms, day zero is the day your test specimen was collected. If you’re asymptomatic and then develop symptoms within 10 days of testing positive, your clock resets: day zero becomes the first day of symptoms.
Shortening the Masking Period With Testing
If you want to stop masking before the five days are up, you can use rapid antigen tests to confirm you’re no longer contagious. Take two tests at least 48 hours apart. If both come back negative, you can drop the mask. If either test is positive, keep testing every 48 hours until you get two consecutive negatives.
What to Do If Symptoms Come Back
Some people feel better for a day or two and then symptoms return, sometimes called rebound. This can happen with or without antiviral treatment. If your fever comes back or your symptoms worsen after you’ve already resumed normal activities, go back to square one. Stay home again until you’ve been fever-free for 24 hours without medication and your symptoms are improving, then restart the five-day masking period.
Longer Isolation for Severe Illness
If your illness was severe enough to require hospitalization, intensive care, or ventilator support, you may remain contagious longer than someone with a mild case. People with severe COVID should isolate for at least 10 days after symptoms first appeared, and in some cases up to 20 days. The same fever-free and symptom-improvement criteria still apply before ending isolation.
Immunocompromised Individuals
People with moderately or severely weakened immune systems, whether from organ transplants, certain cancer treatments, or conditions that suppress immune function, can remain infectious for significantly longer. The recommended isolation period for this group is at least 20 days, regardless of symptom severity. Ending isolation typically involves repeated testing and coordination with a specialist, because standard timelines don’t reliably predict when an immunocompromised person stops shedding virus. Some people in this category remain contagious beyond 20 days.
Protecting Others While You Recover
Even during the masking phase after isolation ends, a few practical steps reduce the risk of spreading the virus to household members or coworkers. Sleep in a separate room if possible. Improve ventilation by opening windows or using air filters. Avoid sharing cups, utensils, and towels. If you live with someone who is elderly, immunocompromised, or otherwise at high risk, the five-day masking window is especially important to observe fully, or use rapid tests to confirm you’re negative before spending extended time together indoors.