Booster and Third Dose

Updated 10/18/2021

COVID-19 Vaccine Booster Dose

On September 24, the Centers for Disease Control and Prevention (CDC) and the Oregon Health Authority recommended a booster dose of the Pfizer COVID-19 vaccine six months after the second dose for the following individuals:

  • Anyone age 65 or older
  • Individuals 50-64 years of age with an underlying condition
  • People living in a long-term care facility

In addition, the CDC said that the following groups of people ages 18-64 may also receive a booster dose of the Pfizer COVID-19 vaccine six months after their second dose:

  • People with underlying medical conditions (Oregon considers all intellectual and developmental disabilities underlying medical conditions.)
  • People who are at higher risk of COVID-19 exposure and transmission due to occupational or institutional settings

These recommendations only apply to the Pfizer-BioNTech (Comirnaty) COVID-19 vaccine, not to the Moderna or Johnson & Johnson vaccines. COVID-19 vaccines are not interchangeable, and any additional doses an individual receives should be of the same brand as their first dose. If you received a third dose as outlined below, you do not need a booster dose at this time. For more information on booster doses, please see this FAQ from the OHA.


Third Dose for Immunocompromised Individuals

A third dose of Pfizer/Comirnaty or Moderna vaccine is now recommended for individuals who have moderately to severely compromised immune systems. Individuals should talk to their healthcare provider about their medical condition and whether getting an additional dose is appropriate for them. Learn more about this recommendation here. You should only receive three doses: Even if you qualify for both the third dose and the booster, you should not receive any more than three doses.

For more information about the difference between a booster shot and a third dose, please see this FAQ from the OHA.