Elderly Australians, people with chronic illness and healthcare workers will be first in line once a coronavirus vaccine is available.

The world has marked another grim milestone after a record one-day increase in global coronavirus cases.

The World Health Organisation has reported more than 338,700 cases in 24 hours led by a surge of infections in Europe.

Global deaths rose to 1.05 million.

Deputy Chief Medical Officer Michael Kidd has reassured Australians a vaccine will not be made available until one is safe and effective at providing an immune response to the virus.

There will likely be prioritisation for who gets it first.

“Obviously people who are most at risk will be at the top of the list,” Professor Kidd said in a video posted to social media.

“This includes our elderly population, it includes people with chronic diseases which put them at increased risk if infected with COVID-19.

“But it also includes the people who provide care to those people. Our wonderful aged care workers, our healthcare workers working right across the sectors in hospitals, in general practices, in pharmacies and in other community health settings.”

The federal government is putting more than $2 billion towards local and international vaccine development.

This week’s federal budget forecasts rely on a coronavirus vaccine being made widely available by late 2021.

Meanwhile, Victoria recorded another 11 cases of coronavirus on Friday but no deaths, keeping the national toll at 897.

It is the second day in a row the state has not added to its coronavirus death toll.

The cases take Melbourne’s all-important 14-day case average down to 9.4.

The city needs a 14-day average of five or fewer cases and no more than five mystery cases to ease restrictions on October 19.

Victorian Premier Daniel Andrews says it is highly unlikely that nothing will change by that date.

“The exact nature of those changes we will need to look at,” he told reporters in Melbourne.

Sydneysiders can travel again to the Top End after the Northern Territory removed its hotspot declaration for the harbour city.

But the border battles continue between NSW and Queensland.

Queensland has set a strict benchmark of 28 days clear of unlinked community transmission before NSW residents can visit.

NSW recorded eight locally acquired cases on Thursday and was given a strict deadline to investigate them before the border clock resets.

But Queensland Premier Annastacia Palaszczuk – who is in the midst of a state election campaign – has muddied the waters by saying it will not automatically occur.

Asked about reopening the border, she said she was not ruling anything out.

Of the eight new cases in NSW, one is being investigated while the rest are linked to a known case or cluster.