Mr Morrison said 80 per cent of Australians registered overseas are now in countries where the new variant is evident.
Another five COVID cases were found in returned travellers, and 25,646 tests reported to 8:00pm last night.
Dr Chant said health authorities are taking an overly cautious approach to the case given the increased transmissibility of the United Kingdom variant.
The New Zealand regime will require travelers from the United Kingdom or U.S. to have approved evidence, such as a written form certified by a laboratory, showing a negative polymerase chain reaction (PCR) test result in the 72 hours prior to departure.
Global air crew must undergo a COVID-19 test in Australia every seven days or on arrival.
"No one is saying that they won't follow rules but we need some relaxation".
"This is a normal part of the evolution. So it is incredibly important that we take these strong measures", Palazczuk said on Friday.
"One case becomes two and two cases become 10 so before you know it, it can get a bit out of control".
NSW Premier Gladys Berejiklian says there are now 21 cases linked to the Berala cluster.
Despite this mystery case, people under lockdown in the northern zone of the Northern Beaches will still be able to leave their homes as of midnight on Sunday.
If you do go outside, Palaszczuk said masks will be mandatory.
Woman with United Kingdom strain flew from Victoria to Brisbane.
"International air crew to be tested in Australia on arrival".
Anyone who returns a positive PCR test will have to undergo further "intensive" testing to identify any virus fragments.
"We know that that strain is 70% more infectious and we know the extreme difficulty that the United Kingdom has had in controlling their outbreak due to that strain", Queensland Chief Health Officer Jeannette Young said.
"That's why we are now following through with her contacts".
"At no point during this pandemic have we ever had a kneejerk reaction or treated the border like a light switch", Acting NSW Premier John Barilaro said.
"But it is not zero risk, so we are just taking all of those precautions". Bare shelves in Brisbane.
Authorities fear such breaches could increase with the more-transmissible U.K. Covid-19 variant.
Brisbane is the capital of Queensland.
The woman, a quarantine worker in her 20s, was stationed at the Hotel Grand Chancellor in Brisbane that housed patients with the mutated strain.
In response to the "stay at home" orders in Queensland, NSW health authorities have ordered travellers from the Greater Brisbane area who are now in NSW to isolate at home until Monday evening.
'If we do not do this now, it could end up being a 30-day lockdown'.
She also posted a photo of herself in a pink crop top, tights and a matching coloured mask as she visited the store ahead of Brisbane's three-day lockdown.
Other states, however, have enforced far more stringent restrictions.
Global air crew must undergo a COVID-19 test in Australia every seven days or on arrival and will need to quarantine in dedicated facilities between flights.
Prime Minister Scott Morrison said all worldwide travellers would now be required to undergo testing before flying to Australia. All Greater Sydney local government areas were declared a hotspot, spanning 35 in total.
Mr Barr also indicated that the new restrictions would essentially keep global students away from Australian universities for the foreseeable future despite initial hopes they would be able to return for semester one.
Victoria continues its case-free streak..
Chief Health Officer Brett Sutton urged Victorians in the Brisbane, Moreton Bay, Redland, Ipswich or Logan council areas of Greater Brisbane to cancel plans to return home, amid the city's hard lockdown.
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