"It is assumed that a population-wide vaccination program is likely to be in place by the end of 2021." - Budget papers, May 11

"The vaccine is likely to be rolled out by the end of this year to all those Australians who want that vaccine. There is the assumption they will get two doses by that time." - Treasurer Josh Frydenberg to reporters in the budget lockup, May 11

"That assumption in the budget last night was based on the best medical advice from the chief medical officer." - Mr Frydenberg on ABC radio, May 12

"No. There are assumptions that go to the rollout. They are not policy settings." - Prime Minister Scott Morrison on ABC TV, May 12

"We are working hard to get that first dose to all Australians as soon as possible." - Mr Morrison, ABC radio, May 12

"(The budget) makes no reference, I note, to second doses, it only refers to doses." - Mr Morrison to parliament, May 12

"I expect some Australians will still be getting vaccinated next year." - Finance Minister Simon Birmingham on ABC radio, May 12

"Our goal is to ensure that the whole of population has the opportunity, through supply, to access a vaccine this year. And if there are some who choose, because of personal circumstances, to have it in the last couple of weeks of the year and this then means they go into the first week of the next year, that does not affect any of the assumptions." - Health Minister Greg Hunt in parliament, May 12

Australian Associated Press