Prime Minister Scott Morrison has highlighted the avenue for every adult to receive the injection after speaking with their GP about the risk of blood clots being so rare.
But state prime ministers and chief health officers warned against ignoring advice from the Australian Technical Advisory Group on Immunization.
It is not recommended for people under 60 years of age to receive AstraZeneca, with Pfizer as the vaccine of choice for that age group.
Australian Medical Association president Omar Khorshid said the federal state spill caused confusion.
“Unfortunately the prime minister threw a few hand grenades into our vaccine programme,” he told Sky News.
The federal government has given doctors legal protection to vaccinate adults of all ages, sparking a rush of young people wanting to own an AstraZeneca.
Queensland’s Chief Health Officer Jeannette Young said she did not want people under 40 to receive injections.
“I don’t want an 18-year-old in Queensland to die of a blood clotting disease which, if they catch COVID may not die,” Young said.
Victoria’s Health Minister Martin Foley said the health department had received confirmation of the Commonwealth’s policy change to expand vaccine rollouts.
“The last thing we need is confusion around vaccines. What we need is certainty and consistency and confidence in the vaccination program,” he said.
WA Prime Minister Mark McGowan also wants people in his state to follow ATAGI’s medical advice.
“That’s the advice we have and that’s national advice from immunization experts,” he said.
“Obviously, the Commonwealth has taken a different approach.”
Federal Health Secretary Greg Hunt said there was no disagreement on medical advice despite states banning under 40s from taking AstraZeneca.
The row over the vaccine comes as more than 12 million Australians in four different states are in lockdown due to the spread of the Delta variant of COVID-19.
NSW recorded 22 new local cases on Wednesday with Sydney and major regional centers remaining on lockdown.
There have been three new cases in Queensland where the southeastern state of Townsville and two nearby islands are also on lockdown.
WA recorded one new infection on the first day of Perth and the four-day lockdown of the Peel region.
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