Professor Brendan Murphy said health authorities are "doing everything they can" to bring the state's virus outbreak under control.
"If this outbreak escalated and we had several hundred cases, that would be the sort of situation where I'd be extremely concerned, but there is no official definition of a second wave," he said.
"At the moment I have great confidence in the Victorian response. This obviously was of concern - they are responding very, very effectively.
"The early signs are that it's not escalating at the moment, but we have to make sure it's brought under control."
Victoria has recorded 16 new cases of coronavirus, taking the state's COVID-19 tally to 1847 after five cases were removed due to duplication.
A fourth Black Lives Matter protester tested positive to COVID-19 in the state. They are not believed to have contracted COVID-19 at the demonstration.
From the 18 cases found overnight, four overseas travellers are still in hotel quarantine and seven are linked to outbreaks in Victoria.
"That's a second small in the number of cases over the last three days in Victoria. We always expected to see some continuing cases in Victoria given the peak that occurred towards the end of last week," professor Murphy said.
"It's still too early to say how the Victorian outbreaks are going but they are throwing every resource at this.
"Their public health response is extensive, there's substantial testing happening in those hotspot areas."
CMO backs hotel quarantine system
Professor Murphy also threw his support behind Australia's ongoing compulsory hotel quarantine system, describing it as "one of our most successful public health interventions".
"There have been tens of thousands of people who have been through hotel quarantine and we have detected hundreds of people with coronavirus and successfully isolated them," he said.
"It is important that we learn how to do it well… I think every state and territory is looking at the hotel quarantine."
He also said that Australia's National Cabinet will review the system so that it adapts as the country's virus response continues into the future, should any major change occur to how COVID-19 spreads.
'Australia is doing relatively very strongly'
The Chief Medical Officer confirmed the Federal Government is continuing to monitor the transmission of coronavirus in overseas nations, with a particular focus on the Americas and India where major spikes in cases have occurred.
"This disease continues to escalate, there are new countries that become hotspots," he said.
"We know that if we've got half a million deaths around the world, if you assume a death rate of around two per cent, (it could be) tens of millions of cases around the world.
"It makes our position relatively very strong… even though we have an issue to deal with at the moment."
He also acknowledged that he believes there is "substantial under-detection" of cases globally that could mean the world's total death toll may be much higher than is yet known.
The United States has recorded almost 2.3 million coronavirus cases, while Brazil's tally is nearing 1.1 million and India has more than 425,000, according to Johns Hopkins University.
https://news.google.com/__i/rss/rd/articles/CBMirQFodHRwczovL3d3dy45bmV3cy5jb20uYXUvbmF0aW9uYWwvY29yb25hdmlydXMtdmljdG9yaWFuLW91dGJyZWFrcy1ub3Qtc2Vjb25kLXdhdmUtY21vLWJyZW5kYW4tbXVycGh5LXF1YXJhbnRpbmUtb3ZlcnNlYXMtc3Bpa2VzLWNvdmlkLTE5LzVlMTJjNGQ5LTgzZWItNGZlMy1hNTZjLWE4Y2U5MDBjZGU2NNIBRWh0dHBzOi8vYW1wLjluZXdzLmNvbS5hdS9hcnRpY2xlLzVlMTJjNGQ5LTgzZWItNGZlMy1hNTZjLWE4Y2U5MDBjZGU2NA?oc=5
2020-06-22 06:09:08Z
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