Victoria has reported 26 new locally acquired cases but the state remains confident it can get a grip on its latest coronavirus outbreak.
The Department of Health tweeted all the cases are linked to current outbreaks and the state carried out 43,674 tests in the 24 hours to midnight.
Of the new cases, 24 had been in quarantine throughout their entire infectious period.
The latest cases come after the state announced 22 new local cases on Wednesday, almost double the 13 that was added to the official tally on Tuesday.
It had been the highest daily spike in the state in 10 months until Thursday's numbers trumped it.
However health authorities said it was promising that 16 of those 22 had been in isolation for their entire infectious period.
Victorians are now expecting to be freed from lockdown at 11.59pm July 27 after Premier Daniel Andrews extended it on Tuesday.
Chief Health Officer Brett Sutton said if Victoria had not made the decision it did about lockdown, it would be in a situation where it was reporting thousands of cases over the coming weeks.
"Delta is a variant that takes off from dozens to thousands of cases within just a matter of weeks," he said on Wednesday.
"If we locked down today instead of when we did, we would get thousands of cases over the next couple of weeks because of where we've gotten to even in lockdown now."
Professor Sutton added the state would be in a "world of hurt" if that was the reality.
"It's very hard to demonstrate what you're avoiding, but I think we would be in a world of hurt, not so much today, but we'd be in a world of hurt over coming weeks if we hadn't done what he did," he said.
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