Australia could be on track to eliminate coronavirus, according to Victorian Chief Health Officer Brett Sutton.
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Professor Sutton confirmed Victoria recorded four new cases of COVID-19 on Friday, although two were "weak positives" and may be removed from the state's tally.
"We will have an expert review panel look at the results and make a call on them definitively as positive or negative," he told reporters on Friday.
The other two cases are under investigation and include someone who had the virus in the past but is likely no longer infectious.
Professor Sutton said one of the cases being investigated had been "in and around" the Deer Park area, which is on the Ballarat train line, before testing positive.
"Until we know more about the potential exposure sites, potential movements of this individual and other close contacts that we can identify, I would encourage anyone who is symptomatic, especially in Deer Park, to look for a testing station nearby," Professor Sutton said.
He thanked 23,583 Victorians who were tested on Thursday, calling them "heroes".
"They are the individuals who mean that we can identify any last remnants of virus that might be circulating in Melbourne and that we can end it," Professor Sutton said.
He said the risk of a third wave was "minimal" but would not be zero until a vaccine was produced.
The state, however, could eliminate the virus "by virtue of finding everything that is out there".
"We're not hanging our hats that, because there could be hidden cases, there could be chains of transmission that go on without being detected," Professor Sutton said.
Asked if Australia could eliminate the virus, he replied: "It's absolutely possible."
"There's a grumbling number of cases in NSW but it's within our grasp and if it's a by-product of everything that we're doing routinely for each and every case, then fantastic," he said.
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The nation is undertaking a suppression strategy that is focused on reducing transmissions to ensure hospitals are not overwhelmed.
Across the Tasman, New Zealand has favoured an eradication strategy.
Victoria has 80 active COVID-19 cases, with five people battling the virus in hospital.
No additional deaths were reported on Friday, with the state's toll from the virus 819 and the national figure at 907.
Meanwhile, testing continues at a childcare centre in Melbourne's northeast after a child possibly attended while infectious.
The young girl attended Good Start Early Learning Centre on Plenty Road at Bundoora on October 20 and 22 then went on to test positive to the virus on Wednesday.
Some 63 staff and students have returned negative tests while 54 results are pending.
About 40 close contacts linked the centre are self-isolating for 14 days.
Melbourne's rolling new case average rose to 2.6, from 2.4, on Friday but mystery cases in the fortnight to Tuesday dropped by half to two.
The corresponding figures for regional Victoria are zero.
Ballarat has not had an active infection since September 8.
Premier Daniel Andrews urged Melburnians to maintain social distancing and good hygiene as they prepare for their first weekend with eased restrictions.
"Enjoy the hard-won freedoms within the rules this weekend," he said.
The premier also confirmed he will take his first day off in months.
"I will not see you tomorrow. The minister for health will conduct the daily briefing. I'm sure you're all very pleased to hear that news," he told reporters at the end of Friday's news conference.
Mr Andrews has held a media conference every day since July 3, making Friday his 120th.
-AAP
