The Omicron variant of the virus crashed on to Australian shores in late November, quickly overtaking Delta as the most common strain in the country.

It is reasonable to expect more variants will emerge, University of Sydney's Dr Megan Steain said, but that does not need to be cause for concern.

"What that variant will look like is almost impossible to predict," she told AAP.

"It could be a further descendant of Omicron but it could also be something that looks closer to Delta or one of the earliest strains.

"But we've got a lot more resources now to handle this virus. Rather than the stricter measures, we need to use booster doses, particularly in vulnerable populations, as well as antivirals."

Victoria is the latest state to remove close to all of its COVID-19 restrictions, with worker vaccine mandates gone from Saturday and masks only required on public transport, taxis, ride shares and planes.

But a Victorian parliamentary hearing was told last week measures like masks should not yet be removed because of the high rates of transmission.

Burnet Institute deputy director Professor James Beeson agreed, telling AAP masks and venue caps could be useful in tackling current and future variants.

"We have to really just accept as a society that at times we are going to have some restrictions," Dr Beeson said.

"We'll just have to keep an open mind about that as a possibility as we go forward to really protect the community."

With more than 95 per cent of Australians double-dosed, vaccines will continue to be the country's biggest defence.

"For the next couple of years, we'll be getting another dose because that does give better protection against Omicron and presumably against a future variant," Dr Beeson said.

The boosters could be incorporated into an annual flu jab, or improved so people would only need a new vaccine every three years or so, he said.

But it all comes down to funding medical research so better vaccines can be developed.

"If nothing improves, then we're not in a great position to keep being at the forefront of medical research," Dr Steain said.

"Medical research is expensive. We've got great scientists here but a lot of them end up out of the job or moving because they can't secure a position or funding to do the work.

"It's going to require continued investment over many years to ensure that we're in a better position."

LATEST 24-HOUR COVID-19 DATA:

NSW: 9472 cases, 26 deaths, 1499 in hospital with 51 in ICU

Victoria: 7769 cases, 24 deaths, 402 in hospital with 29 in ICU

Queensland: 4802 cases, six deaths, 497 in hospital with seven in ICU

Tasmania: 1157 cases, one death, 45 in hospital with three in ICU

NT: 248 cases, no deaths, 12 in hospital with one in ICU

WA: 5770 cases, two deaths, 259 in hospital with nine in ICU

SA: 2686 cases, four deaths, 223 in hospital with seven in ICU

Australian Associated Press