COVID-19 Vaccination FAQ for International Students and Scholars

Vaccines Accepted by Yale

Yale will accept any combination of COVID-19 vaccines that have received full approval or Emergency Use Authorization (EUA) by the U.S. Food and Drug Administration (FDA) or have been issued Emergency Use Listing (EUL) by the World Health Organization (WHO). This list will be updated as new vaccines are approved or authorized.



COVD-19 mRNA Vaccine (nucleoside modified)

Pfizer – BioNTech Manufacturing GmbH

COVID-19 mRNA Vaccine (nucleoside modified)

Moderna TX, Inc

COVID-19 Vaccine (Ad26.COV2-S [recombinant])


Novavax Novavax, Inc

International vaccines currently authorized for emergency use by the WHO:

Vaccine WHO EUL Holder

COVD-19 mRNA Vaccine (nucleoside modified)

BioNTech  Manufacturing GmbH

COVID-19 Vaccine (ChAdOx1-S [recombinant])

AstraZeneca AB / SK Bioscience Co. Ltd

AstraZeneca AB

COVID-19 Vaccine (ChAdOx1-S [recombinant])

Serum Institute of India Pvt. Ltd

COVID-19 Vaccine (Ad26.COV2-S [recombinant])

Janssen–Cilag International NV
COVID-19 mRNA Vaccine (nucleoside modified)

Moderna Biotech

ModernaTX, Inc


Inactivated COVID-19 Vaccine (Vero Cell)

Beijing Institute of Biological Products Co., Ltd. (BIBP)
COVID-19 Vaccine (Vero Cell), Inactivated

Sinovac Life Sciences Co., Ltd

Covid-19 vaccine (Whole Virion Inactivated Corona Virus vaccine)
Bharat Biotech International Ltd

COVID-19 vaccine (SARS-CoV-2 rS Protein Nanoparticle [Recombinant])

Serum Institute of India Pvt. Ltd

COVID-19 vaccine (SARS-CoV-2 rS [Recombinant, adjuvanted])

Novavax CZ a.s.


(Cansino Ad5-nCoV-S vaccine)


The Centers for Disease Control and Prevention (CDC) currently considers people to be fully vaccinated two weeks after the final dose of their primary series and up to date once receiving all recommended COVID-19 vaccines, including any booster dose(s) when eligible.


These frequently asked questions may be helpful to Yale’s international students and scholars currently outside of the U.S. who are making plans to come or return to Yale.

I was unable to get vaccinated at home. Can I be vaccinated when I arrive at Yale? Will I need to quarantine?

Vaccination prior to arrival is strongly encouraged. For those unable to do so, Yale is preparing to vaccinate any student or staff member who is not adequately vaccinated on arrival. Travel quarantine and testing upon arrival will be required per the university guidelines. You will need your net ID to self-schedule a vaccine through the Yale vaccine program.

Do I have to complete my arrival quarantine before getting my vaccine?

No. Vaccine and urgent health visits are considered medically necessary, and you can receive your vaccine during your arrival quarantine period. Please remember to wear an appropriate mask to your vaccination appointment and follow all other university travel guidelines. Additionally, please follow the university’s health and safety measures until you are fully vaccinated. You are considered fully vaccinated two weeks after receiving both doses in a two-dose series. or one dose of a single-dose vaccine. 

Should I delay getting the vaccine offered in my home country and wait until I arrive at Yale?

COVID-19 continues to spread globally resulting in serious illness, hospitalizations and deaths. Vaccination slows transmission and prevents development and spread of virus variants so it is recommended that you get vaccinated as soon as possible with vaccine that is readily available.

I received a COVID-19 vaccine in another country that has not received approval by the FDA or EUA from the WHO. Should I be re-vaccinated at Yale?  

At this time, the CDC is recommending additional vaccination with FDA approved vaccines for those who received doses of WHO-unapproved vaccines (see table below). We will assist international students with vaccination upon arrival in New Haven. Please plan your travel with a goal of reaching full vaccination status by the time your program starts. 

Recommendations for International Students Who Have Received a Non-FDA approved or WHO-approved vaccine or are Unable to Access Vaccine

Based on the CDC’s Interim Clinical Considerations for Use of COVID-19 Vaccines Currently Approved or Authorized in the United States

Guidance for those who received a COVID-19 vaccine listed for emergency use by WHO but not approved or authorized by FDA

Vaccination history

Recommended actions

Received all recommended primary doses for that vaccine

  • Do not repeat primary series
  • Administer mRNA vaccine booster dose at least 5 months after last primary series dose

Received partial primary series for that vaccine

  • Administer a single dose of an mRNA vaccine at least 28 days after receipt of first dose to complete primary series
  • Administer mRNA booster dose at least 5 months after last primary series dose

Received a booster dose after completion of primary series

  • Do not repeat booster dose

Guidance for those who received a heterologous primary series composed of doses of a COVID-19 vaccine listed for emergency use by WHO, at least one of which is not FDA-approved or authorized

Vaccination history

Recommended actions

Received two doses of vaccine

  • Do not repeat primary series
  • Get mRNA vaccine booster dose at least 5 months after last primary series dose

Received a booster dose after completion of primary series

  • Do not repeat the booster dose

Guidance for those who received all or some of the recommended doses of COVID-19 vaccines that are NOT FDA-authorized, FDA-approved, or among those listed for emergency use by WHO

Vaccination history

Recommended actions

Received any number and combination of vaccine doses

  • Doses received do not count toward vaccination in the US
  • Start primary series at least 28 days after the last dose of vaccine
  • Get mRNA vaccine booster dose at least 5 months after completion of primary series

*The EUI provides a legal framework for heterologous use of mRNA COVID-19 vaccines (i.e., Pfizer-BioNTech and Moderna) in people who received a non-FDA authorized or approved COVID-19 vaccine outside of US.

See guidance on booster doses for people who are not moderately or severely immunocompromised and people who are moderately or severely immunocompromised, for information on the option of a second booster dose for some people.

COVID-19 vaccines that are listed for emergency use by WHO that are not FDA-authorized or FDA-approved have not been evaluated for efficacy or safety by CDC or ACIP.


  • Yale recommends Pfizer or Moderna over Janssen/J&J because there is more data available on high effectiveness of the mRNA COVID-19 vaccines against variants of concern. Janssen/J&J remains an option for those who strongly prefer a single dose, or have an allergy to the Pfizer or Moderna vaccines or one of their components.
  • Individual students with questions about their circumstances may consult with Student Health by emailing
  • Students who, after consultation with Student Health, decide they are unable to follow the guidance in the table above may request a medical exemption and will be required to follow the requirements for members of the community who are not vaccinated which currently include mask wearing, practicing 6’ distancing, weekly asymptomatic testing, and quarantine if close contact of a case.

I received one dose of a two-dose vaccine in another country, can I get the second dose at Yale?

Yes. However, the vaccines available for distribution in the U.S. are Pfizer, Moderna, and Janssen. If your first dose was not one of these three, the CDC recommends vaccination with an mRNA vaccine 28 days after the first dose of two-dose series. 

Canada (and other countries) is mixing vaccines for the first and second dose. What should I do to comply with Yale regulations?  

If there is only one option, you will want to follow protocol while home. If you have different options and want to ensure that you pursue the best option, please provide a list and we can assist you. Once you receive all necessary doses of vaccine, submit your information through the Yale Student Vaccine Portal.

I will not be able to get two shots of the same WHO-EUL, or FDA-approved or authorized vaccine due to restrictions in my country. What combinations of vaccines will Yale accept?

If you received two doses of mixed (heterologous) primary series and the series contained only the vaccines listed above, you are considered fully vaccinated and do not need to repeat the primary series. A vaccine that has not received WHO EUL or FDA-approval or authorization does not count toward vaccination in the US.

I received my first shot at home 3 months ago.  When I return to campus can I still get the second dose?

It is always best to receive vaccinations as close to the recommended schedule as possible. However, given many issues related specifically to COVID vaccination, Yale is not setting strict requirements for the time period between shots. If you get your second shot outside of the recommended time period, you will be considered in compliance.

I am an international student starting at Yale.  I will receive my 1st dose when I arrive, but won’t be able to receive the 2nd dose until after classes start. Will I be able to go to class while I await my 2nd dose?

All students are required to be fully vaccinated by the time school starts. Please get in touch with your specific school Dean if you feel you will not be able to fulfill this requirement.

In my country, those who have had COVID need only one shot of a two-dose vaccine. Does Yale accept this?

No. Yale follows CDC recommendations which require both doses of a two-dose vaccine, regardless of infection history.

I’ve had COVID-19. Do I still need to get vaccinated and boosted?

Yes, vaccination and booster doses provide the best protection. You may be vaccinated after completing the isolation period required for infection or choose to wait 4 weeks after your positive test date to receive your COVID-19 vaccine. A prior infection or evidence of antibodies does not substitute for full vaccination, i.e. both doses in a two-dose series or one dose of a single-dose vaccine.

My test for antibodies is positive, do I still need to be vaccinated?

Blood tests for antibodies to SARS-CoV-2 will not be accepted in place of vaccination. At this time, antibody tests cannot be interpreted as proof of immunity to COVID-19 and are not recommended post vaccination. People with positive antibody tests who are not fully vaccinated will not be exempted from public health requirements including weekly testing.

What about boosters?

Students and scholars are required to receive booster doses following completion of their primary series when eligible. Documentation of booster doses should be uploaded to the portal. 

Does the COVID-19 vaccination cost anything?

We are offering COVID-19 vaccination to the Yale community at no cost. Bring a photo ID and health insurance card with you to your vaccine appointment. Yale Health members can download or print a version of their Yale Health insurance card which contains the required information.

How do I schedule a vaccine appointment?

You can schedule your vaccine online to receive it on campus at 310 Winchester Avenue. You can also schedule through the many options in the state through the Connecticut Department of Health vaccine portal.  If you need assistance, please call the Campus COVID Resource Line (CCRL) at 203-432-6604.

I am coming to campus with my spouse, can they be vaccinated at Yale as well?

Spouses can receive their vaccine through the Yale COVID-19 Vaccine Program. Spouses of Yale employees who are not Yale Health members can schedule their appointment through the many options available across the state.

Can I put my vaccination information from outside Yale into my electronic medical record?

Yes, all students, faculty, staff and trainees are required to submit their COVID-19 vaccination record to the university for COVID-19 monitoring across the Yale community.

I have more questions about my specific situation where can I get more information?

You can call the CCRL at (203) 432-6604 or your primary care provider. The Office of International Students and Scholars also maintains a comprehensive COVID-19 update on their website, including information about arrival, travel and quarantine requirements.  


Updated August 11, 2022