As more transmissible strains of the Omicron variant emerge, discussions are underway as to what measures could be used to curtail the spread.
Queensland Premier Annastacia Palaszczuk said talks were ongoing over whether mask rules would return in some settings in the Sunshine State.
"We are not doing a mask mandate, but there are discussions happening about urging people in certain situations to wear masks," she said.
Meanwhile, ACT Health Minister Rachel Stephen-Smith said a fresh mask mandate was not being ruled out.
However, she indicated other options were being considered.
"There is a view that mandatory mask requirements might not be as effective as they have been in the past, partly because those people who are willing to wear masks are already doing so," she said.
"Some of those settings where we're seeing transmission you wouldn't be required to wear a mask anyway, so all of those things need to be balanced as we move through this winter period."
Victorian Chief Health Officer Professor Brett Sutton said the BA.4 and BA.5 strains had become dominant in Geelong and Melbourne wastewater detections.
They were expected to overtake the BA.2 strain to become dominant across the state.
"The Department of Health anticipates the prevalence of BA.4/BA.5 in Victoria is likely to result in an increase in cases - including reinfections - and hospital admissions and deaths," Prof Sutton said on Monday.
"This is because the strain has a greater ability than BA.2 to evade immunity provided by vaccination and earlier COVID-19 infection."
There were 26 deaths from COVID-19 recorded across Australia on Monday, taking the national death toll to 10,039.
Hospitalisations had reached 3511 across the country, the highest levels since February during the height of the Omicron wave.
Nearly 30,000 infections were reported nationally on Monday, with experts warning case numbers will climb even further as winter progresses.
Despite the rise in cases, border restrictions that were brought in as a result of the pandemic will be enforced for their final day on Tuesday.
Changes to the Biosecurity Act will come into effect on Wednesday, with international arrivals no longer needing to declare their vaccination status to enter the country.
The decision was welcomed by Australian Federation of Travel Agents chief executive Dean Long, who said the move was a critical step for the industry.
"Removing these last requirements will help reduce delays in airports and make it easier for Australians coming back home," he said.
"With school holidays underway or about to kick off in many states and territories, and a rapidly growing number of Australians keen to escape the Australian winter, the pressure on our airports and airport staff is huge."
LATEST 24-HOUR COVID-19 DATA:
NSW: 10,504 cases, 14 deaths, 1782 in hospital with 58 in ICU.
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