The recommendations for people vaccinated outside of the United States depend on the number and type of vaccine(s) received for the primary series and/or booster dose(s). People who initiated vaccination outside of the United States are considered to be up to date with their COVID-19 vaccines when they have completed the CDC recommended actions.
If at least 5 months have passed since you received vaccine that is not authorized by the U.S. FDA but is listed for emergency use by WHO, you should receive an age-appropriate mRNA booster. Pfizer-BioNTech COVID-19 Vaccine can be used in people ages 5 years and older and Moderna COVID-19 Vaccine can be used in people 18 years and older. The 11 COVID-19 vaccines that have been issued Emergency Use Listing (EUL) by WHO are Pfizer-BioNTech (COMIRNATY), Moderna (Spikevax), Janssen/J&J, AstraZeneca (Vaxzevria), Serum Institute of India (COVISHIELD), BIBP/Sinopharm, Sinovac (CoronaVac), Bharat Biotech (COVAXIN), Serum Institute of India (COVOVAX), Novavax (NUVAXOVID), and CanSino (Convidecia).
If you received a COVID-19 vaccine that is not authorized by the U.S. FDA or listed for emergency use by WHO, you may start over with an age-appropriate mRNA COVID-19 vaccine (Pfizer or Moderna). Please note that no data are available on the safety or effectiveness of COVID-19 vaccination after receiving a non-FDA-authorized or approved COVID-19 vaccine. Wait at least 28 days after you received the last dose of the non-FDA-authorized or approved vaccine before receiving another vaccine.
For more information and recommendations for people who are moderately or severely immunocompromised, see the CDC recommendations for people who received COVID-19 vaccines outside of the United States.