Third Dose COVID-19 Vaccine


Book your third dose vaccine today

If you’re over 18 and you had your second vaccination four or more months ago, you’re eligible for your third dose.

COVID-19 Pfizer and Moderna third doses are now available to anyone aged 18 and over. If you had your second dose 4 months ago or earlier, you are due for your third now.

You need your third dose to keep up your immunity against COVID-19.

You can get a Pfizer or Moderna third dose regardless of which COVID-19 vaccine you received for your initial doses.

AstraZeneca can be used as a third dose if you:

  • received AstraZeneca for your first two doses, and there are no contraindications or precautions for use   
  • had a significant adverse reaction to a previous mRNA vaccine dose (for example, Pfizer or Moderna) that means you cannot have another dose of an mRNA vaccine.

If you’re not sure which vaccine you’re eligible for, talk to your GP.

Use the guide below to work out when you are due.

If you received your second dose in: Have your third dose in:
August or earlier December
September January
October February
November March
December April

Your third dose will also appear on your Australian Immunisation Record.

You can get a third dose if you have completed an initial vaccination course overseas with a COVID-19 vaccine recognised by the Therapeutic Goods Administration.

Third doses are different from third primary doses, which are given to people with severe immunocompromise 2-6 months after their second primary dose.

The Australian Technical Advisory Group on Immunisation (ATAGI) now recommends people with severe immunocompromise receive a fourth dose four months after their third primary dose, so they can have the same level of protection as the general population.

Read more on how to book your vaccine appointment for a third dose, including information on walk-in options.

How to check when you had your second dose

You can access your COVID vaccine date in your COVID-19 digital certificate. Find out how to get proof of your vaccination.  

Translated information about COVID-19 vaccines

Information about COVID-19 vaccine rollout and safety in languages other than English

Accessed 8th January 2022

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