Victorian health authorities have revealed concerning details about "stranger to stranger" transmission of COVID-19 that sent the state into a snap seven-day lockdown.
COVID-19 testing commander Jeroen Weimar singled out Melbourne shopping centres as venues of most concern where transmission may have occurred through "very fleeting contact".
"They don't know each other's names. That's very different to where we have been before," Mr Weimar said.
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"What we're seeing now is people are brushing past each other in a small shop, they are going to display home, they are looking at photos in a Telstra shop.
"This is relatively speaking, relatively fleeting. They do not know each other's lives, and that is very different from what we have been before."
Craigieburn Central, Bay St Port Melbourne, Clarendon Street in South Melbourne, Epping Plaza, Epping North Shops and Broadway Reservoir were cited as areas of most concern.
"If you are a user of the shopping centres if you have been around the shopping centres in the last two weeks, I would really encourage you to come forward and get tested," Mr Weimar said.
READ MORE: Victoria COVID-19 exposure sites spiral past 300
Victoria Health Minister Martin Foley confirmed the state today recorded three new confirmed cases of COVID-19, one remains under investigation.
Mr Foley said many of Victoria's cases could be traced back to a case from hotel quarantine in South Australia.
He confirmed a "mystery case" in an aged care worker was linked to that infection.
"I can update Victorians that the aged care case yesterday, the first one - the Arcare worker - the genomic sequencing has confirmed that case is directly linked to the South Australian hotel outbreak quarantine," Mr Foley said.
"That is at least confirming in our mind that this is all the one related cluster from the South Australian hotel breach."
Mr Foley said all staff and residents at Blue Cross in Sunshine and Arcare in Maidstone had returned negative tests since positive cases identified yesterday.
The three new cases are in addition to the six announced yesterday. Victoria has 63 active cases.
A vaccination blitz is underway in Victoria, with aged care and disability workers now a top priority.
From tomorrow until Sunday, commonwealth managed private aged care homes and the residential disability sector will be given priority access to walk-in vaccination hubs around Victoria when they present evidence of their employment.
The Royal Exhibition Building, the Melbourne Convention and Exhibition Centre, Sandown Racecourse, the Melbourne Showgrounds, and the former Ford factory in Geelong are among those workers can get a walk-in vaccination.
In regional Victoria, the Bendigo community clinic, Ballarat Mercure Hotel and Convention Centre and the Shepparton Showgrounds will be open to walk-ins for eligible employees.
