Third Dose Vaccine Appointments

COVID-19 (Third Dose) Vaccine Prescreening Questionnaire

Some immunocompromised people are now eligible to receive a third dose of the COVID-19 vaccines made by Pfizer-BioNTech or Moderna. If you think you may be eligible, please complete the prescreening questionnaire below.





Eligibility Status: YES Based on your responses, you are eligible to receive an additional dose of the Pfizer-BioNTech COVID-19 vaccine. Please fill out and submit form below and we will contact you to set-up an appointment.

*Denotes a required field

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Eligibility Status: Not eligible at this time
Based on your response, you are not eligible to receive additional doses of vaccine at this time.
Please continue to check the Vaccine Information page on the Mount Sinai South Nassau website for updates.



Eligibility Status: Not eligible at this time
Based on your response, you are not eligible to receive additional doses of vaccine at this time.
Please continue to check the Vaccine Information page on the Mount Sinai South Nassau website for updates.

Eligibility Status: Not eligible at this time
Based on your response, you are not eligible to receive additional doses of vaccine at this time.
Please continue to check the Vaccine Information page on the Mount Sinai South Nassau website for updates.

Currently, CDC is recommending that moderately to severely immunocompromised people receive an additional dose. This includes people who have:

  • Active treatment for solid tumor and hematologic malignancies
  • Receipt of solid-organ transplant and taking immunosuppressive therapy
  • Receipt of CAR-T-cell or hematopoietic stem cell transplant (within 2 years of transplantation or taking immunosuppression therapy)
  • Moderate or severe primary immunodeficiency (e.g., DiGeorge syndrome, Wiskott-Aldrich syndrome)
  • Advanced or untreated HIV infection
  • Active treatment with high-dose corticosteroids (i.e., ≥20mg prednisone or equivalent per day), alkylating agents, antimetabolites, transplant-related immunosuppressive drugs, cancer chemotherapeutic agents classified as severely immunosuppressive, tumor-necrosis (TNF) blockers, and other biologic agents that are immunosuppressive or immunomodulatory
  • Chronic medical conditions such as asplenia and chronic renal disease may be assiciatred with varying degrees of immune deficit

Frequently Asked Questions

How long after getting my initial COVID-19 vaccines can I get an additional dose?
CDC recommends the additional dose of an mRNA COVID-19 vaccine be administered at least four weeks after a second dose of Pfizer-BioNTech COVID-19 vaccine or Moderna COVID-19 vaccine.

Can you mix and match the vaccines?
For people who received either Pfizer-BioNTech or Moderna’s COVID-19 vaccine series, a third dose of the same mRNA vaccine should be used. A person should not receive more than three mRNA vaccine doses. If the mRNA vaccine product given for the first two doses is not available or is unknown, either mRNA COVID-19 vaccine product may be administered.

What should immunocompromised people who received the J&J/Janssen vaccine do?
The FDA’s recent EUA amendment only applies to mRNA COVID-19 vaccines, as does CDC’s recommendation.

Emerging data have demonstrated that immunocompromised people who have low or no protection following two doses of mRNA COVID-19 vaccines may have an improved response after an additional dose of the same vaccine. There is not enough data at this time to determine whether immunocompromised people who received the Johnson & Johnson’s Janssen COVID-19 vaccine also have an improved antibody response following an additional dose of the same vaccine.

What are the benefits of people receiving an additional vaccine dose?

An additional dose may prevent serious and possibly life-threatening COVID-19 in people who may not have responded to their initial vaccine series. In ongoing clinical trials, the mRNA COVID-19 vaccines (Pfizer-BioNTech or Moderna) have been shown to prevent COVID-19 following the two-dose series. Limited information suggests that immunocompromised people who have low or no protection after two doses of mRNA vaccines may have an improved response after an additional dose of the same vaccine.

What are the risks of vaccinating individuals with an additional dose?
There is limited information about the risks of receiving an additional dose of vaccine, and the safety, efficacy, and benefit of additional doses of COVID-19 vaccine in immunocompromised people continues to be evaluated. So far, reactions reported after the third mRNA dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate.

However, as with the two-dose series, serious side effects are rare, but may occur.

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