Victoria has recorded two new locally acquired COVID-19 infections, both linked to current outbreaks.
One was in quarantine throughout their entire infectious period and the other is a colleague of a Melbourne testing site worker at Moonee Valley Racecourse who was briefly in the community before isolating.
Health Minister Martin Foley on Saturday said the fellow traffic controller shared a car after work with the first traffic controller, whose diagnosis was confirmed this week.
"He (the second traffic controller) was isolated as soon as he was identified as close contact and didn't have much time in the community," Mr Foley said.
He visited Devon Plaza shopping centre in Doncaster on July 28, so anyone there between 10.20 and 11.25 should isolate and get tested, he said.
Authorities are still investigating how the first Moonee Valley worker contracted the virus.
Initial results from genomic testing have linked the case to the outbreak at Maribyrnong's Ariele apartment complex sparked by a crew of NSW removalists.
But so far no origin for the Frankston man's infection with the Delta strain has been established.
He visited his partner at a Newport apartment building while infectious and it is a close contact of this person who was the second positive case recorded on Saturday.
Meanwhile, more than one million Victorians are now fully vaccinated with the government making a slight change to the Pfizer jab rollout in its state-run clinics.
Mr Foley on Saturday announced that as of Monday all people who receive a first dose of Pfizer will wait six weeks - not three - for their second dose.
The delayed second dose is the same strategy being used in Sydney to protect more of the population faster and has also been done in the UK and Canada.
GP clinics run by the Commonwealth will continue to administer second Pfizer doses three weeks after the first dose.
Victoria conducted 32,760 virus tests and administered 19,502 vaccination doses in the 24 hours to Friday evening.
The state is managing 180 active cases, including seven in hospital. Two of the hospitalised patients are in intensive care, one of whom is ventilated.
Victoria is living under relaxed restrictions since coming out of its fifth lockdown, however private gatherings are not yet permitted and strict mask-wearing applies.
Australian Associated Press