Restrictions in Western Australia will be further eased this coming weekend, but its hard border will remain given the "extremely concerning" situation in Victoria.
Overseas, Brazil's COVID-19 death toll has officially passed 50,000, formerly coronavirus-free New Zealand now has nine active cases, and the mayor of South Korea's capital fears the country is losing control over a resurgence of the disease
Victoria has confirmed 16 new cases of coronavirus in the past 24 hours, its sixth consecutive day of double-digit increases.
Australia's Chief Medical Officer Brendan Murphy gave the following breakdown of those cases:
Seven are linked to known outbreaks
Five are under investigation
Four involve overseas travellers in hotel quarantine
Yesterday, the Australian Health Protection Principal Committee revealed that 83 per cent of new coronavirus cases in Australia over the past week had come from Victoria.
However, Professor Murphy said he had "great confidence" in the Victorian response.
"The early signs are that it is not escalating at the moment. We have to make sure it is brought under control," he told a media conference this afternoon.
The Victorian Government says testing will be ramped up in six Melbourne local government areas identified as hotspots: Hume, Casey, Brimbank, Moreland, Cardinia and Darebin.
Professor Murphy says people should not be travelling to and from those areas.
Ms Mikakos said legal stay-at-home directions had not been issued, but "we don't rule anything out".
Premier Mark McGowan has announced Western Australia will move to phase four of eased restrictions from 27 June — this coming Saturday.
The changes include:
Removing restrictions on how many people can attend gatherings (though the 2-square-metre rule will remain)
Removing seated-service requirements at licensed venues
Removing the requirement for businesses to keep a patron register
Allowing major sport and entertainment venues to operate under a 50 per cent capacity rule (meaning Optus Stadium can allow 30,000 attendees)
Allowing Crown Casino's gaming floor to reopen under agreed restrictions, including only every second machine being available
However, Mr McGowan said there would be no change to Western Australia's hard border because this had been key to the state's success and the situation in Victoria was "extremely concerning".
"Reimposing restrictions like Victoria has had to is the last thing I ever want to do," he said.
The mayor of South Korea's capital Seoul says he fears the country is losing control over a resurgence of coronavirus.
Park Won-soon also said the city would reimpose stronger social-distancing measures if the daily jump in infections does not drop below an average of 30 over the next three days.
He cited research by health experts showing the country could possibly be reporting as many as 800 new cases a day a month from now if it fails to stem the current trends in transmissions.
In a separate briefing, Jeong Eun-kyeong, director of the Korea Centres for Disease Control and Prevention, acknowledged that the country was now going through a second wave of the virus, following a surge in late February and March centred around the south-eastern city of Daegu.
South Korea has been reporting about 40 to 50 new cases per day since late May, mostly from the Seoul metropolitan area, where about half of South Korea's 51 million people live.
The country was reporting about 500 new cases per day in early March, but managed to control the outbreak with an active testing and contact tracing campaign.
Brazil officially passes more than 50,000 deaths
Brazil, the world's biggest coronavirus hot spot after the United States, has officially passed 50,000 coronavirus deaths, a blow for a country already grappling with more than 1 million cases, rising political instability and a crippled economy.
Brazil now has a total of 1,085,038 confirmed cases and 50,617 deaths, up from 49,976 on Saturday, the Health Ministry said.
But experts say the true numbers are a lot higher because of a lack of widespread testing. Latin America's largest country has typically recorded more than 1,000 deaths a day, but usually registers fewer on the weekends.
Brazil confirmed its first case of the novel coronavirus on February 26 and passed 1 million cases on Friday.
The rapid spread of the virus has eroded support for right-wing President Jair Bolsonaro, and has raised fears of economic collapse after years of anaemic growth.
Mr Bolsonaro has been widely criticised for his handling of the crisis — the country still has no permanent health minister after losing two since April, following clashes with the President.
The Brazilian leader has shunned social distancing, calling it a job-killing measure more dangerous than the virus itself, and has also promoted two anti-malarial drugs as remedies
Another two cases confirmed in New Zealand
New Zealand has reported two more cases of coronavirus, involving people returning from India and Pakistan, taking the total number of active cases in the country to nine.
Earlier this month, there were no cases in the country at all.
However, health officials say all those cases involve people who have recently arrived in the country and who are in quarantine, and say there is no evidence of community transmission.
Many nevertheless remain anxious that community transmission could return, especially after health officials admitted making a mistake by allowing two women who had arrived from London to leave quarantine before they had been tested because one of their parents was dying.
The women later tested positive and have since isolated themselves.