NSW is racing to trace the source of a mystery coronavirus case in Sydney's northern beaches as Australia faces an anxious wait to see if a highly contagious strain of COVID-19 has spread from Brisbane.
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NSW recorded four new locally acquired cases of COVID-19 on Friday, including one that remains under investigation.
Earlier on Friday, Queensland Premier Annastacia Palaszczuk announced Greater Brisbane would enter a three-day lockdown after a cleaner at a quarantine hotel was diagnosed with the more infectious UK virus strain.
On Friday night the NSW government implemented a new public health order requiring anyone in NSW who had been in Greater Brisbane since 12:01am on January 2 to follow the same lockdown rules.
Travellers from the area will only be able to leave their house or accommodation until 6pm on Monday to shop, exercise, work if they cannot do so from home, perform care or seek medical care.
People who have arrived in NSW since January 2 after transiting through Brisbane Airport will not be subject to the requirements.
Anyone already in transit from Greater Brisbane to NSW must abide by Queensland's isolation rules, and act as if they had remained in Brisbane.
Acting Premier John Barilaro said NSW authorities were working with their counterparts in Queensland but the state was not considering a hard border.
"At no point during this pandemic have we ever had a kneejerk reaction or treated the border like a light switch," he told reporters on Friday.
Queensland's COVID-19 case prompted Prime Minister Scott Morrison on Friday to reduce the number of international arrivals into NSW, WA and Queensland's hotel quarantine systems by 50 per cent.
A weekly cap in NSW has been set at 1505 people until at least February 15.
Overseas travellers will need to test negative to COVID-19 before departing for Australia, and daily coronavirus testing is now required for quarantine workers.
Meanwhile, NSW Health on Friday night issued new casual-contact health alerts for the Artisaint Cafe at the Crowne Plaza Sydney Burwood and the Burwood Bing Lee on the morning of January 6.
Those who attended Westfield Burwood and several shops inside the complex on January 6 and 7 have also been advised to monitor for symptoms, as have patrons of Costume clothes shop at Avalon Beach on New Year's Eve.
A prior alert for Sydney Marina restaurant in Pendle Hill has also been upgraded to a casual-contact alert, meaning patrons must seek testing.
The suburbs north of Narrabeen Bridge on Sydney's northern beaches, meanwhile, have been under stay-at-home orders since before Christmas but that restriction is due to be lifted from Sunday.
Australian Associated Press