VICTORIA'S list of exposure sites has soared past 270 as the state recorded five new locally-acquired cases of COVID-19 overnight.
An aged care home in Melbourne's north-west is in lockdown after a COVID-positive worker became the state's first "mystery case" of the outbreak.
The Altona woman worked at Arcare Maidstone on Wednesday and Thursday and might have been infectious at the time.
She sought testing as soon as she fell ill on Friday and was among five new locally-acquired cases reported in Victoria on Sunday.
The aged care home has been placed into lockdown and residents are self-isolating, with authorities unsure how the worker picked up the virus.
The woman, a healthcare provider in contact with aged care residents, was vaccinated on May 12.
Authorities administered more than16,700 vaccinations on Sunday with another 43,874people who got tested for the virus.
There are now 54active cases across Victoria.
Meanwhile on Sunday, Victorian Treasurer Tim Pallas announced a $250 million support package to help impacted businesses through the lockdown, something Bendigo businesses welcomed.
A full list of COVID-19 exposure sites is available here.