VICTORIAN authorities say the state's run of four zero community transmission days is reassuring, but the battle against COVID-19 won't be won until the Australian population is vaccinated.

Health Minister Martin Foley urged the community to remain vigilant about the coronavirus.

Mr Foley thanked Victorians for the efforts to stop the spread of COVID-19 after the Black Rock cluster.

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"It's not an achievement we can rest on our laurels though, because we know that as 2021 evolves, this isn't over until the Australian population is vaccinated," he said.

Earlier

SIX new COVID-19 cases have been diagnosed in Victoria on Sunday, all confined to hotel quarantine.

It comes as Australia fights to keep a more infectious, strain of COVID-19 at bay.

Victoria, NSW and the Northern Territory all revealed cases of the mutant strain from the United Kingdom in hotel quarantine on Saturday.

National cabinet has adopted several new measures to protect Australia against the strain, now spreading around the world.

These include pre-flight testing of returning Australians, mandatory masks on domestic and international flights and a limit on international arrivals to certain states.

A total 23,412 COVID-19 test results were received by the Department of Health and Human Services to Sunday.

With AAP.

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