'Obviously we're concerned by the increase in number, ' Ms Mikakos said.
Australia's Victoria state will implement mandatory coronavirus tests for returning travelers after a sharp spike in infections over the past two weeks, the state's premier said on Sunday.
The surge in cases in Melbourne, the capital of Australia's second-most populous state, have been centred around suburbs in the city's northern and western fringes.
"I think it will get worse before it gets better", the state's chief health officer, Brett Sutton, said.
There were two new family outbreaks in Truganinna in Melbourne's west, with five cases, and in the Patterson Lakes-Lysterfield area in Melbourne's south-east, with four cases.
Health minister Jenny Mikakos said one of those cases was in hotel quarantine, 14 are linked to outbreaks, 37 were detected through routine testing and 23 are still under investigation.
"We have seven states and territories at the moment in Australia, where there is either no or virtually no community transmission ... and what that means is resources that are available in other states can also be deployed to assist", the prime minister said.
Ms Mikakos said a link had also been established between the North Melbourne family outbreak and the Brimbank family outbreak, with four of the new cases related.
The Stamford Plaza hotel cluster gained three cases, and the Wollert cluster grew by one.
Professor Sutton said it was hard to explain why it was happening in Victoria now when the state was in lockdown longer than other states.
Asked about new lockdown orders, he said: 'The public health directions changing the law is something we have to consider because we have to do whatever is required to turn this around'.
Over the weekend the government launched a "testing blitz" of ten hotpot suburbs in Melbourne.
Sutton said the numbers were "absolutely concerning" and indicated outbreaks occurring "across multiple households, across work and other settings".
"We know that it is a real challenge for businesses, it is a real challenge for people in their homes if that is what is required".
The schools are Queen of Peace Parish Primary School in Altona Meadows, Aitken Hill Primary School in Craigieburn, Fitzroy High School and Port Phillip Specialist School and St Bernard's College in Essendon.
"We also have a staff member at the Red Cross processing facility, that's called the Lifeblood Red Cross processing facility, and there is contact tracing under way and cleaning will be undertaken as well".
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