An initial target of October has proven unachievable due partly to dosage import delays and health concerns, with an end-of-2021 timeframe also off the table, Scott Morrison said on Sunday.

“The government has … not set, nor has any plans to set any new targets for completing first doses,” Morrison said in a social media post.

“While we would like to see these doses completed before the end of the year, it is not possible to set such targets given the many uncertainties involved.”

Earlier in the day, senior minister Dan Tehan told Sky News’ Sunday Agenda program the government’s aim was to have all Australians injected with at least one dose of the vaccine by the end of the year.

But that deadline was later retracted.

“We will just get on with the job of working together to produce, distribute and administer the vaccines as safely and efficiently as possible,” Morrison said.

The rollout was thrown into disarray last week after health authorities recommended AstraZeneca vaccines should only be given to Australians aged over 50, following concerns about blood clotting.

Health Minister Greg Minister insists GPs have not been put off participating in the rollout of the COVID-19 vaccine program because of the AstraZenaca advice.

InDaily reported on Friday that one Adelaide GP, whose practice is supplied 400 AstraZeneca doses a week by the federal government, was threatening to withdraw from the rollout after being “inundated” with “abusive” callers concerned about receiving the AstraZeneca jab.

Hunt said GPs have “flocked” to participate in the vaccine program in the coming week, and said vaccine indemnity agreements are already in place for any doctors who may be concerned about being sued if the AstraZeneca jab was administered to a younger person.

Hunt said while Pfizer is preferred for those under 50, AstraZeneca is available, subject to the medical discussion between a doctor and their patient

“On indemnity, I want to make something very, very clear,” he told reporters in Melbourne.

“Australia already has vaccine indemnity agreements in place. I am saying this on behalf of the government but also on behalf of our legal advice, no doctor need worry.”

Australian Medical Association president Omar Khorshild said it is critical for Australia’s future that public confidence in the vaccine program is maintained.

“Your GP will give you the best advice about any medicine or vaccine,” he said.

“They will offer you what they believe to be of medical benefit to you and explain any risks and benefits of having, or not having, the treatment.”

Labor’s health spokesman Mark Butler said the government should have secured more vaccine deals to ensure there was a backup plan when something like the AstraZeneca situation arose.

“We are now in a very difficult situation,” Butler told ABC’s Insiders program.

“Australia was already way behind schedule in the vaccine rollout, not in the top-100 nations in the world, and a bad situation has been made far worse by these unforeseen events around the AstraZeneca vaccine.”

A report released by the McKell institute today says delays to Australia’s vaccine rollout could cost the nation more than $1.4 billion.

There were no cases of COVID-19 community transmission in Australia on Sunday. SA Health reported one new case from a child in a medi-hotel, while a man in his 40s with the virus remains in a critical condition in the Royal Adelaide Hospital.

-with AAP