UT University Health Services

Vaccine guidance for persons who received COVID-19 vaccines outside of the U.S.

Only people who have received all recommended doses of a U.S. FDA-authorized or World Health Organization (WHO)-listed COVID-19 vaccine are considered fully vaccinated for the purpose of public health guidance.

If you completed any of these COVID-19 vaccines series, you are considered fully vaccinated according to the current U.S. Centers for Disease Control and Prevention (CDC) guidelines. No additional vaccines are recommended at this time.

  • Pfizer – BioNTech
  • Moderna
  • Johnson & Johnson /Janssen
  • Sinopharm
  • AstraZeneca/Oxford
  • Sinovac
  • Covishield (AstraZeneca)
  • Comirnaty (Pfizer/BioNTech)

If you took one dose of the Moderna or Pfizer-BioNTech COVID-19 vaccine series but were not able to complete the series before arriving in the U.S., you should complete your series at the earliest recommended interval upon arrival. The second dose of Pfizer should be administered 21 days after the first injection. The second dose of Moderna should be administered 28 days after the first injection.

If you started the Sinopharm, AstraZeneca/Oxford, Sinovac, Covishield or Comiranaty vaccines but did not complete the series, the CDC advises that you begin and complete a vaccine series with a U.S. FDA-approved vaccine when you arrive in the U.S.*

If you started or completed a COVID-19 vaccine not listed above, CDC guidance states you may consider taking a complete FDA-authorized COVID-19 series when you arrive in the U.S.*

*The minimum interval between the last dose of a non-FDA authorized vaccine or a WHO-listed vaccine and a U.S. FDA-authorized COVID-19 vaccine is 28 days.

Interim Clinical Considerations for Use of COVID-19 Vaccines Currently Authorized in the United States

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University Health Services is committed to providing high-quality care to patients of all ages, races, ethnicities, physical abilities or attributes, religions, sexual orientations, or gender identities/expression.


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