Victoria has recorded its first day of zero locally acquired Covid cases since its most recent outbreak began on the first day of Melbourne's eased restrictions.
Melburnians can now leave their home beyond the five essential reasons and can meet up in groups of 10.
However masks must be worn in all public settings and people cannot travel further than 25km from their home.
A ban on home gatherings remains in effect, students can return to schools, retail can reopen and hospitality venues can resume seated service.
Health authorities are desperately working to discover the source of four cases in a Reservoir household identified on Thursday.
None of the cases have visited previously identified exposure sites, nor are they contacts of previous cases.
"These new cases are really the strongest reminder that we are, by no means, out of the woods yet," Deputy Chief Health Officer Allen Cheng told reporters yesterday.
Authorities are awaiting genomic testing to see if they have the Delta or Kappa strain of the virus, while their close contacts are self-isolating.
The Department of Health's testing chief Jeroen Weimar identified the cases as a separate cluster, the fifth of the outbreak.
The state has recorded 90 cases since the first of the outbreak were detected on May 24.
Professor Cheng said he remains "anxious" over a missing link between hotel quarantine and the highly-infectious Delta variant cluster.
The state reported 17,604 tests received, well below the 25,000 Chief Health Officer Brett Sutton said was need entering a "critical" two-week period.
More than 20,000 vaccine jabs were administered.
There was one cases detected in hotel quarantine in the past 24 hours.
Restrictions have eased further in regional Victoria, with more industries to reopen, two visitors allowed at homes and masks only compulsory indoors.
There are 75 active cases in the state.