Australians have been urged to "kick back into gear" and take coronavirus safety seriously, as NSW makes masks mandatory.
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Victoria has recorded three new locally acquired coronavirus cases and is ramping up testing sites to deal with long queues.
Another additional case came from hotel quarantine, bringing the total number of active cases in the state to 36.
The Black Rock cluster in bayside Melbourne, seeded from NSW's northern beaches outbreak, prompted a swift crackdown by the state government on border rules last week.
Victorian Premier Dan Andrews said people could have been forgiven for thinking it was all over, after 60 days of zero cases in his state.
"But this virus was never going to just go away," he tweeted.
"As hard as it is, we all have to kick back into gear and get on top of it."
Queensland recorded no new locally acquired cases on Monday, but has five overseas acquired cases.
NSW latest figures are yet to be released.
State authorities across the country are scrambling to deal with with dual pressures of an influx of school holiday travellers seeking to cross borders and people wanting COVID-19 testing.
There have been reports of waits of up to six hours for testing in Queensland.
Federal Labor leader Anthony Albanese said the prime minister should step in deal with some of the "confusion".
"It would be far preferable if we had some form of national coordination and national leadership of these issues," Mr Albanese told reporters in Sydney.
"We need a far more consistent response."
Mr Albanese, a self-confessed sports fan, said he would not be attending the Test cricket match which starts on Thursday in Sydney.
"The problem is it sends mixed messages," he said.
"The idea that you had to have just five people in your home on New Year's Eve, but you can have 20,000 people at the Sydney Cricket Ground, is something that Gladys Berejiklian and the NSW government needs to explain."
Sydneysiders who flout new mandatory mask rules from Monday risk a $200 fine.
But NSW police have been asked to exercise discretion in handing out fines to those who ignore the new rules.
Masks are mandatory in shopping centres, on public transport, in places of worship, hair and beauty premises, entertainment venues such as cinemas and other indoor venues like post offices and banks.
Hospitality workers are also required to wear one.
Mandatory masks have been introduced as a suburban bottle shop causes a headache for authorities trying to limit the spread of coronavirus.
Tens of thousands of people have been affected.
NSW Health is currently treating 125 people with COVID-19, none of whom are in intensive care.
NSW police say a southwest Sydney venue operator will be fined $5000 after hosting a wedding attended by at least 600 people.
Queensland is keeping a close eye on case numbers in NSW and Victoria as it weighs up further action.
Meanwhile, Labor is concerned cuts to the JobKeeper support program which started on Monday will remove critical support from the economy.
But the federal government insists now is the right time to taper payments, as business and consumer confidence starts to recover.
From Monday, people on the top rate of JobKeeper will see their payments cut by $200 a fortnight, while workers on the lower part-time rate will face a cut of $100.
Australian Associated Press