If you test positive for COVID-19, follow-up testing is not necessary.
Follow-up testing is not used to indicate that a COVID-19 infection has cleared. This is because some people can remain positive for up to several weeks due to non-infectious antigen remnants in their nasal passages.
Individuals can end their isolation and return to school or work and other activities after completing an isolation period of at least 5 days (if fully vaccinated or under 12 years old) or 10 days (if not fully vaccinated or immunocompromised) from symptom onset and until they have no fever and symptoms have been improving for 24 hours (or 48 hours if gastrointestinal symptoms), whichever is longer in duration. Follow-up testing is not necessary throughout or after completion of the isolation period and should not be requested by a school or an employer.
Please note: The isolation periods described above relate to the general public. Management of COVID-19 cases and contacts in highest risk settings is different.
For more information on isolation requirements, please see You have symptoms and are concerned you may have COVID-19. Now what? and What to Do If You’ve Been Exposed to COVID-19.