Who Needs a 3rd Primary Dose of the Covid-19 Vaccine?

Severely immunocompromised people should receive a third dose of the COVID-19 vaccine as part of their primary course, the Australian Technical Advisory Group on Immunisation (ATAGI) has confirmed.

This 3rd primary dose is only for those who has a significant reduction in their immunity. It’s not for those who have “a weak immune system” or “feel a bit run down”. Those who have immunocompromising conditions (such as cancer) or are on therapies that reduce their immunity, may not develop adequate immunity from the standard double vaccinations of the Covid-19 vaccines, whether AZ or Pfizer. The 3rd dose is intended to maximise the level of immune response to as close as possible to the general population.

The eligibility criteria is listed here……


We recommend you speak to your GP or specialist regarding your specific recommendations prior to booking your 3rd primary dose.

Pfizer or Moderna mRNA vaccines are preferred to AstraZeneca for the third dose. At Your Family Doctors we have plenty of supplies of Pfizer.

The recommended interval for the third dose is 2–6 months after the second dose, but a minimum interval of four weeks may be considered in exceptional circumstances.

Further advice on booster doses, including for healthcare workers, older adults and the general population, is expected at a later date.

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