Booster shot mandates for healthcare workers are being ushered in by various state emergency coordinators.  ATAGI stated it is “acceptable to co-administer” different brands of COVID-19 vaccines, though Pfizer and Moderna are “preferred over” AstraZeneca.

Each state and territory of Australia is under their own State of Emergency, and as such the Chief Health Officers (CHO) issue Directions independent of each other.  Except for South Australia where it is the “emergency coordinator” Police Commissioner Grantly Stevens, who hands down vaccine mandate Directions.