Victoria has its deadliest day in the coronavirus pandemic, with 19 deaths and 322 new cases.
The number brings the state's death toll to 229 and the national number to 314.
However, experts are confident that Melbourne's fourth-tier lockdown will bring the outbreak under control as daily case numbers stabilize.
On Sunday, Nick Coatsworth, Australia's deputy chief medical officer, said Victoria had passed the peak of the outbreak.
Passengers on a Qantas domestic flight from Melbourne ride on buses going to hotel quarantine at Sydney International Airport
A man is arrested by police in Victoria on Sunday after protesters demonstrated against the lockdown
Melbourne's busy shopping malls were usually empty on Sundays
A woman walks down the street during an anti-lockdown protest in Melbourne on Sunday
"It looks like we're on the plateau, but we're looking for the turning point that tells Victorians that their efforts will be rewarded," he said.
“We haven't seen that yet, but I have no doubt we'll see it. If you consider that the third level restrictions were almost on a plateau, the fourth level restrictions will produce an outcome. & # 39;
Around 500 new cases have appeared in Victoria every day for the past seven days, and on Sunday there are 394 new cases with 17 new deaths.
Dr. Coatsworth said the pandemic is challenging because you "never really know where you are on the curve".
The rate of spread of the virus is referred to as the "reproductive number" or R-0.
Victoria has suffered a record 19 deaths and 322 cases from coronavirus
Hari Krishnas happily sings on the foreshore of St. Kilda on Sunday. Experts have determined that Victoria's daily rate of new infections appears to be falling
This graph shows that the coronavirus infection rate in Victoria appears to be falling from a high of 725 cases on Wednesday August 5th
A family frolics in a St Kilda Park in Melbourne on Sunday as new case numbers fall
When the R-0 is one, R-1 means that each person with the virus is passing it on to another person.
Numbers above R-1 mean that a virus is spreading exponentially. However, when the reproductive number falls below one, the virus slowly gushes out.
COVID-19 has a natural median reproductive number of R-5.7, according to a study published in the journal Emerging Infectious Diseases, which explains why it exploded across Victoria.
Victoria's outbreak now has a base reproductive number of R-1 – or just below, said Dr. Coatsworth on Sunday.
"The ideal situation would be if we could see that reproduction number at 0.5," he said.
"We don't have enough data from the numbers right now to see if that approaches 0.5, but we will see that in the coming days up to the week."
Six people were arrested on Sunday and 27 fined for violating restrictions in a lockdown protest called the Melbourne Freedom March.
Queensland recorded a new case of coronavirus, a traveler in hotel quarantine, Monday morning.
The elderly care homes in Queensland are now open to visitors again. Authorities are confident that two infected teenagers who avoided quarantine did not spread coronavirus.
Officials were on high alert over an outbreak linked to the women who moved around the community for a week after returning from Melbourne in July.
"Today was the very important day," said Prime Minister Annastacia Palaszczuk, referring to the end of the two-week period since police isolated the women.
"The restrictions on care for the elderly are being lifted, which means a lot to families, especially in the last week when they could not see their loved ones."
Jeannette Young, chief health officer, said the Bolton Clarke aged care facility in southwest Brisbane would have to remain closed for a day and a half.
"Until we have confirmation that the potential outbreak is over," she said.
According to The Australian, grim secret modeling by the Victorian government leaked Wednesday estimated the daily case load would rise to 1,100 by the end of this week.
The bad prognosis showed that the number of cases would then be over 1,000 per day and would not fall below the current level until the end of August.
But Prime Minister Daniel Andrews said no one in his administration or the federal government was aware of the modeling.
A lone protester was arrested after a scheduled anti-lockdown rally failed to take place in Melbourne on Sunday. Due to the hard lock and the mandatory face masks, new infection numbers have already dropped, which gives the community hope
Little Italy on Lygon Street, Melbourne, on Sunday, where 22 premises that once housed cafes and restaurants are now empty. The residents hope that the situation will return to normal in six weeks
Professor Tony Blakely from the University of Melbourne also said The outbreak has already peaked thanks to wearing the mask.
& # 39; It looks like the curve turned on July 30th. But more importantly, it makes sense. & # 39; he said.
The professor said July 30 had passed about a week after the Victorian government introduced mandatory mask-wearing – which is also slightly more than the virus's five-day incubation period.
Wearing masks seems to have bent the curve, which is what would be expected. In other words, the numbers would now be higher without a mask and much higher again without level 3 restrictions, ”he said.
He predicted a significant drop in smoothed day numbers would occur about 10 days after Victoria put restrictions on Level 4 on Thursday.
He said once the numbers drop to around 200 a day, which he expects the fourth level restrictions to be hit, the contact tracing teams will be less overwhelmed and the state will be able to keep the numbers down.
Professor Tony Blakely's five-day averages chart predicted that Victoria's breakout has already peaked and is now on its way down. Professor Blakely is optimistic that face masks and the lockdown have already reduced virus transmission
People are enjoying Melbourne's St. Kilda Pier with their masks and face shields on Sunday as residents adhere to tier four lockdown rules to help quell the virus outbreak
As of Sunday, 1,725 of Victoria's health care workers had been hit by the virus, of which 994 are still active cases.
Melbourne's metropolitan area was hit hardest with 13,445 cases, compared with just 889 from regional Victoria.
As of Sunday, the state recorded 394 new cases, bringing the state's total to 14,659, of which 7,854 are active.
Dr. Coatsworth urged everyone to download and activate the government's COVIDSafe app on their cell phones. This is necessary now as states other than Victoria are loosening their locks.
"We see what happens when you have an essentially open economy like you do in New South Wales," he said.
"And this is where COVIDSafe comes into its own."
In Sydney's western suburbs, 544 people were tracked through the app, which resulted in the positive identification of two new COVID-19 cases, said Dr. Coatsworth.
New South Wales recorded 10 new coronavirus cases on Sunday, only one of which was a returned overseas traveler in hotel quarantine.
St. Kilda Pier, Melbourne, pictured on Sunday. There have been 19.9 million coronavirus cases worldwide
Seven new cases are close contacts with previous cases while two are under investigation.
New South Wales is the only other state that keeps reporting new cases. In the past week, the new case numbers fluctuated between 10 and 15.
Health officials have warned against complacency in New South Wales after 11 new infections with no known source were found.
Globally, there were 19.9 million coronavirus cases as of Monday morning, of which 6.3 million are active cases, 12.7 million have recovered and 731,104 people have died according to Worldometers statistics.
The country with the highest numbers was still the US with 5.1 million cases, followed by Brazil with 3 million and India with 2.2 million.