“I think there’s every chance that there are a handful of cases out there, this is a wildly infectious virus,” he said on Wednesday. “You’ve always got to assume there’s more out there than you know.”
There have been 20,345 cases of COVID-19 in Victoria and 819 deaths, most of them among the elderly in aged care.
Victorians will be able to enter Queensland from next Tuesday after its extended run of zero-case days.
Queensland Premier Annastacia Palaszczuk announced on Wednesday morning she would reopen the border to Victorian travellers on December 1, after the southern state recorded its 26th consecutive day without a COVID-19 case.
NSW opened to Victoria on Monday, while Tasmania is due to open from Friday. South Australia will allow Victorians to enter the state without restriction again on December 1.
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Victorians are already permitted to enter ACT and the Northern Territory has been allowing regional Victorians to enter without quarantining since November 2, but still classifies metropolitan Melbourne as a hot spot.
NT Chief Minister Michael Gunner has previously spoken of his intention to allow Melburnians back into the territory by Christmas.