Third dose for severely immunocompromised people – COVID-19 vaccine
Third doses are for eligible severely immunocompromised people as part of a 3-dose primary course. Third doses are not a booster dose. Additional booster doses may be required for people eligible for a third dose.
Severely immunocompromised people aged 5 and over are strongly encouraged to receive a third dose of the COVID-19 vaccine 2–6 months after the second dose.
This is because you may have a decreased immune response to the standard 2-dose COVID-19 vaccination schedule and be more at risk from severe COVID-19. This third dose is to maximise your level of immune response to as close as possible to the general population.
- Over 12 years of age with severe immunocompromise—refer to the ATAGI statement for a list of included medical conditions.
- 2–6 months since your second COVID-19 vaccine dose
People who are mildly to moderately immunocompromised are not recommended by ATAGI to have a third dose at this stage.
How to book
Speak with your GP or treating specialist to discuss your individual circumstances. You can book a third dose appointment online or with a participating GP or pharmacy. You may be asked to provide evidence of your medical condition or a referral letter from your GP or specialist at your appointment.
Vaccine types for third doses
The Pfizer (Comirnaty) or Moderna (Spikevax) vaccines are the recommended third dose regardless of which vaccine you had for your first 2 doses.
You can also receive the AstraZeneca (Vaxzevria) vaccine if you:
- can’t have the Pfizer or Moderna vaccine for medical reasons
- had 2 doses of the AstraZeneca vaccine previously.
Vaccination records and certificates
Details of your third dose will automatically be uploaded to your Immunisation History Statement and your COVID-19 vaccination certificate will be updated to show your last 2 doses.
Read more about getting proof of your COVID-19 vaccination.