Victoria's Acting Premier, James Merlino, has announced circuit breaker restrictions that will start from 11:59pm on May 27 and last till 11:59pm June 3.
"That number will continue to grow and change", he said.
Merlino said the Indian variant of the virus was moving faster than its contact tracers. They have never done that before.
He said "the time between catching the virus and passing it on is faster than ever", being only one day-compared to a five-day period previously seen previously.
Victoria state Chief Health Officer Brett Sutton said he "absolutely expects" more positive cases to emerge in the coming days as the variant, first detected in India, was likely to be more virulent than the original strains.
Merlino said from tonight there will be only five reasons for Victorians to leave home.
"There's been opportunities to spread to people".
While many would see waiting in line for two hours as doing their part for the nation, the man was clearly so frustrated he couldn't get the vaccine immediately, he was happy to express his opinion on Channel 10's national news. "When we see a member become infected, nearly all the household is infected", he said.
"It speaks to the infectiousness of this B".More news: At least 8 killed in shooting at California rail yard
"To put that in some perspective, the usual transmission is about five to six days - In some of these cases, within a day it's been transmitted".
The additions bring the number of people in Victoria's latest cluster to 26.
There are now 34 active coronavirus cases across the state, with 26 of those linked to the new cluster.
So far, more than 70 exposure sites have been confirmed, with nine new locations reported overnight, including at places like football venues and nightclubs.
Most of those cases are linked to a man in his 60s who fell sick on May 17.
The only other possibility is that Case A was infected as he entered the country, somehow tested negative three times, and had the virus incubating in his system for 22 days before it developed into an infection.
"It's not where we hoped it would be, it's not where it should be. But sadly we are not".
Shops, banks, petrol stations and pharmacies will remain open, while schools will be closed but children of key workers and vulnerable children will still need to attend. Restaurants, pubs and cafes can only stay open for takeaway.More news: Cummings opens fire on ministers over pandemic
Higher education will move to remote learning only. Those in Greater Melbourne must wear a face mask indoors.
Anyone with symptoms who had been in the wider Melbourne area since May 11 should also ring Healthline and arrange a test.
One of those cases is now in intensive care in hospital and on a ventilator.
Additional vaccine doses were also being sent to Victoria.
Victoria has also expanded its vaccination programme in an attempt to combat the spread of the virus.
In response to the new outbreak, Victoria will also accelerate its state-run vaccination program, with those over 40 years old now free to receive the Pfizer COVID-19 vaccine at state vaccination hubs.
"We need you to make a booking, so I really encourage everyone, if you are eligible, get vaccinated, " he said.
"If we had the vaccine, the Commonwealth's vaccine programme effectively rolled out, we may well not be here today".
Prime Minister Scott Morrison batted away the criticisms, saying "no system is foolproof" and pointing to Australia's now low infection and death numbers when compared to other countries around the world.More news: Italian cable auto crash kills nine, injures two children
"There are no certainties, no guarantees, in a global pandemic".