Victoria has recorded two new local COVID-19 cases, both linked to a mystery case who works as a traffic controller at a testing site in Melbourne's west.
One of the new cases is the partner of the Moonee Valley Racecourse worker, who was in quarantine for their infectious period.
They live at a Newport apartment complex that has been listed as a high-risk exposure site.
Health Minister Martin Foley said the second case was another traffic controller working at the testing site, and who shared a car with the first case.
He said the man spent "very limited time in the community" before testing positive.
The Woolworths supermarket at Devon Plaza in Doncaster, in Melbourne's north-east, was added as a tier 1 exposure site overnight after being visited by the man on Wednesday. He was identified as a primary close contact after the supermarket visit.
The two new cases were detected from 32,760 test results processed on Friday.
The first traffic controller tested positive just hours after Victoria's fifth lockdown was lifted at 11:59pm on Tuesday.
Genomic sequencing has confirmed he has the same Delta strain of the virus as the rest of the cases in the outbreak so far, but authorities are still working to determine exactly how he acquired the virus.
Chief Health Officer Brett Sutton said it was "overwhelmingly" the likely explanation that the first case picked up the virus from a positive case who was at the site for testing.
Authorities are still working to establish why there have been detections of COVID-19 in wastewater in catchments in the north-west and east.
There are 180 active cases in the state, including those in hotel quarantine, a drop of 20 from yesterday.
Seven people with COVID-19 are in hospital, with two of those in an intensive care unit. One of those people requires ventilation.
Interval between Pfizer doses lengthened at state centres
There were 19,502 doses of COVID-19 vaccines administered at state-run centres on Friday. A similar number each day is delivered through the Commonwealth's mechanisms.
Mr Foley announced that the minimum amount of time between the first and second doses of Pfizer would be lengthened from three to six weeks at state-run sites.
Advice from Australia's vaccine advisory group is that anywhere between three to six weeks is an effective window.
"That does front-load the first doses for Victorians and allows more to receive that first dose in coming weeks," the Chief Health Officer said.
A first dose provides a high level of protection against serious illness, with the second dose providing even more.
It will not change anything for those who already have a booking, or for people getting the vaccine through the GP network.
"The Commonwealth vaccination providers, our GPs, and Aboriginal community-controlled health organisations will continue to provide second doses at an interval of three weeks," Professor Sutton said.
Professor Sutton said the AstraZeneca vaccine was a "terrific vaccine" that was appropriate for "many, many people in Australia right now".
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2021-07-30 23:05:31Z
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