In an interview withThe Sun-Herald andThe Sunday Age,Mr Hunt provided new details about the expected arrival of Pfizer vaccines,while cautioning the timeline is subject to consistent supply.

Mr Hunt said about 4.5 million Pfizer doses were expected in Australia by the end of June,rising to seven million doses of Pfizer in both the third and fourth quarters of 2021. As previously announced,another 20 million doses would arrive in the last quarter.

He said the vaccine doses would arrive at consistent levels each week meaning “an available pool of two million doses[a week] for 13 weeks in the final quarter of 2021”.

The new detail in the government’s vaccine plan comes after a difficult first few months in which the target of4 million jabs by the end of March was badly missed. The government later dumped vaccination targets entirely.

The number of vaccines delivered daily passed 100,000 for the first time on Friday and the total number of Australians who have received at least one jab has now passed 3.4 million.

Mr Hunt was criticised last week for assuring over-50s that “as supply increases later on in the year,there will be enough mRNA vaccines for every Australian”,because that cohort is being encouraged to get their AstraZeneca (non-mRNA) jab now.

Mr Hunt toldThe Sun-Herald andThe Sunday Age:“People should not wait. The medical advice is unequivocal,we want as many Australians over 70 and over 50 to be vaccinated as soon as possible and as other age groups open up,for each of them to be vaccinated as soon as possible.”

Dr Khorshid said the government and community must “set a timeline and firm targets for vaccination rates before opening up[as] that will provide motivation for Australians to get vaccinated”.

Professor McCaw and Associate Professor Wood said the apparent efficacy of both vaccines in reducing total transmission by as much as 90 per cent was “really exciting and a huge additional benefit”,and offered Australia the chance to reopen safely earlier,but it depended on take-up.

They were speaking after preliminary results from a UK study released on Friday showed that two shots of the AstraZeneca vaccine may be 85 to 90 per cent effective against symptomatic illness.

Associate Professor Wood said with open borders Australia needed to reduce the transmissibility of the virus by about 75 per cent to control the spread without additional restrictions. “So the actual amount of[vaccine] coverage has to be a bit higher,probably about 80 to 85 per cent,” he said.

That supports Premier Gladys Berejiklian’s declaration last week that 80 per cent of the state’s adults - or 5 million people - had to be fully vaccinated before international travel could resume.

Professor McCaw said vaccination coverage “definitely has to be way over 50 per cent” to reopen,and the higher the better. At that point “you would be able to manage it without having to go to full shutdown”.

“That’s absolutely clear from the data we’re seeing now,” he said. “All it needs is for people to get vaccinated. If people don’t take it,we’re not getting ourselves anywhere.”