If you have completed a series of a World Health Organization (WHO) approved vaccine, you should not start a new series in the U.S. The CDC states that only people who have received all recommended doses of an FDA-approved, FDA-authorized, or WHO-listed COVID-19 vaccine are considered fully vaccinated for the purpose of public health guidance.

If you received vaccines not currently approved by the WHO or CDC, talk with your primary care provider about how to proceed with vaccination in the US.