COVID-19 Vaccine Booster Shots and Third Doses

At this time, federal health officials recommend additional doses of COVID-19 vaccines for specific groups of people. Public health officials ask that you only seek a third dose or a booster if you qualify for one at this time.

  • A COVID-19 booster shot is an additional dose of the vaccine that helps people maintain their level of immunity for longer. Booster doses are given to people who have built enough protection after their vaccine, but that protection decreases over time, a situation called waning immunity.
  • A third dose of the COVID-19 vaccine is an additional dose of the vaccine that is given to individuals who cannot build up enough protection when they get the initial vaccination because their immune systems are weakened, a condition called immunocompromise.

The following groups are eligible to receive a COVID-19 booster shot:

  • People age 18+ who received the one-dose Johnson & Johnson vaccine at least two months prior.
  • People 65 years and older who completed the two-dose series of the Pfizer or Moderna vaccine at least six months ago
  • People age 18+ who live in long-term care settings and who completed the two-dose series of the Pfizer or Moderna vaccine at least six months ago
  • People age 18+ who have underlying medical conditions and who completed the two-dose series of the Pfizer or Moderna vaccine at least six months ago
  • People age 18+ who work or live in high-risk settings and who completed the two-dose series of the Pfizer or Moderna vaccine at least six months ago

Learn more about COVID-19 booster shots.

The CDC recommends that people who have moderately or severely compromised immune systems receive a third dose of the Pfizer or Moderna COVID-19 vaccine. A third dose can be administered at least 28 days following the two-dose regimen of the same vaccine.

Individuals who are immunocompromised are more likely to get severely ill from COVID-19 and are at a higher risk for prolonged COVID infection and viral shedding. They are also more likely to transmit the COVID-19 virus to household contacts and are more likely to have breakthrough infections.

Individuals with moderate to severe immunocompromise include those who:

  • Are in active treatment for solid tumor and hematologic malignancies
  • Have received solid-organ transplant and are taking immunosuppressive therapy
  • Have received CAR-T-cell or hematopoietic stem cell transplant (within 2 years of transplantation or taking immunosuppression therapy)
  • Have moderate or severe primary immunodeficiency (e.g., DiGeorge syndrome, Wiskott-Aldrich syndrome)
  • Have advanced or untreated HIV infection
  • Are in 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.

The need for the third dose for this group is not due to a waning effect of the two-dose regimen; rather, data show the standard two-dose regimen does not produce the same degree of protective effect in immunocompromised individuals as it does in people who are not immunocompromised. Patients who are immunocompromised should consult with their health care provider to discuss additional precautions and any questions they may have about protecting themselves from COVID-19.

Learn more about the CDC recommendations for third doses.

Booster shots are intended to bolster the effect of the initial dose(s) of the vaccine. Data has shown that after several months the effectiveness of the vaccine, while still substantial, does decline somewhat. This does not mean that the vaccine is no longer working. According to the CDC, the COVID-19 vaccines still work very well to prevent severe illness, hospitalization, and death, even against the widely circulating Delta variant. However, with the Delta variant, public health experts are starting to see reduced protection against mild and moderate disease. The booster shots will help vaccinated people maintain that protection over the coming months.

Booster shots are used for many types of vaccines, such as for tetanus or whooping cough. Unlike an additional dose of vaccine that is given to individuals who are immunocompromised and do not build up enough protection when they get the initial vaccination, booster doses are given to people who have built enough protection after their vaccine, but that protection decreases over time, a situation called waning immunity.

Talk with your health care provider about any questions or concerns you have about getting a COVID-19 vaccine booster shot.

It depends on which COVID-19 vaccine you received first:

  • If you received the one-dose Johnson & Johnson vaccine, you are eligible to receive a booster shot at least two months after you received your initial dose of the Johnson & Johnson vaccine.
  • If you had the two-dose series of the Moderna or Pfizer vaccine and you meet the eligibility criteria, you can receive a booster shot beginning at least six months after you completed the initial two doses of vaccine.

At this time, boosters of the Pfizer vaccine are available from most vaccine providers in our region. However, many vaccine providers in New York are awaiting guidance from the state Health Department on providing booster shots of the Moderna and Johnson & Johnson vaccines, so they may not be immediately available.

You can receive a single booster dose of any of the available COVID-19 vaccines, regardless of which vaccine you received initially. However, you must meet the eligibility and timing requirements for a booster based on the vaccine you first received.

For example, if you initially had the Johnson & Johnson vaccine, you can receive a single booster dose of the Johnson & Johnson vaccine, the Moderna vaccine, or the Pfizer vaccine as long as you are 18 or older and as long as it has been at least two months since you received your initial dose of the Johnson & Johnson vaccine.

Likewise, if you completed the two-dose series of the Moderna or Pfizer vaccine, you can receive a single booster dose of the Johnson & Johnson vaccine, the Moderna vaccine, or the Pfizer vaccine as long as you meet the eligibility criteria (age 65 and older, age 18-64 at high-risk of severe COVID-19, and age 18-64 with frequent institutional or occupational exposure to the COVID-19 virus) and as long as it has been at least six months since you completed your initial two doses of vaccine.

Check with the COVID-19 vaccine providers in your community. Booster shots of the Pfizer vaccine are widely available through pharmacies, local health departments and other providers. However, many providers are awaiting guidance from the New York State Health Department on providing booster shots of the Moderna and Johnson & Johnson vaccines and may not yet have them available. Find a vaccine provider in our county-by-county list.

If you or someone you know is homebound in the Finger Lakes Region and would like to receive a first dose, booster shot, or third dose of the COVID-19 vaccine, click here.

Public health officials ask that you only seek a booster dose if you qualify for one at this time. The FDA and CDC base their authorizations and recommendations on the latest data, updating their guidance as scientists and medical experts review evidence about COVID-19 immunity and each individual COVID-19 vaccine. These science-based recommendations help keep people safe, which is why CDC advises people against seeking booster doses if they are not in the recommended groups.

The COVID-19 vaccines continue to be remarkably effective in reducing fully vaccinated people’s risk of severe disease, hospitalization, and death. If you have questions about your risk of COVID-19, how to protect yourself from COVID-19, or about the vaccines, speak to your health care provider.