Isolation (for those diagnosed or presumed to have COVID-19): If you are asymptomatic (never develop symptoms), day 0 is the day you were tested (not the day you received your positive test result), and day 1 is the first full day following the day you were tested. People who never develop symptoms should isolate for a full 5 days after their first positive SARS-CoV-2 test (i.e., days 0 through 5). Wear a well-fitting mask for 10 days following your positive test result (if asymptomatic) to limit spread when around others at home and in public. If you develop symptoms soon (i.e., within a week) after your positive test result, the clock restarts at day 0 on the day of symptom onset.
If you have mild symptomsexternal icon, day 0 of isolation is the day of symptom onset, regardless of when you tested positive, and day 1 is the first full day following the day your symptoms started. Persons with mild symptoms should isolate for a full 5 days after symptom onset (i.e., days 0 through 5) and until symptoms have improved. If you continue to have fever or your other symptoms have not improved after 5 days of isolation, you should wait to end your isolation until you are fever-free for 24 hours without the use of fever-reducing medication and your other symptoms have improved. Wear a well-fitting mask for 10 days following your onset of symptoms to limit spread to others in the home or other close contacts.
Quarantine: If you have received all vaccine and booster doses recommended by CDC, you do not need to quarantine. You should wear a well-fitting mask around others for 10 days from the date of your last close contact with someone with COVID-19 (the date of last close contact is considered day 0). Get tested at least 5 days after you last had close contact with someone with COVID-19, and follow isolation recommendations if your test result is positive.
For people who have not received all recommended vaccine doses, including a booster dose for people 18 years of age or older, a 5-day quarantine period is recommended. Day 0 starts the day you had close contact with confirmed COVID-19, and day 1 is the first full day following the last close contact. Wear a well-fitting mask for 10 days (i.e., days 0 through 10) after your last close contact, including when around others in public and at home, especially if there are people in your household who are unvaccinated or immunocompromised or at high risk for severe disease.