South Australia has followed Victoria’s lead and announced tighter border measures on travellers from New South Wales.
Residents from Greater Sydney will be unable to travel to South Australia without undertaking 14 days of quarantine from midnight on Sunday.
Anyone who has been in the Northern Beaches will be locked out entirely.
Those who do arrive will have to have a coronavirus test three times, once on arrival and again on days five and 12 of isolation.
People arriving from regional New South Wales will be allowed in but must undergo a test on arrival.
Premier Steven Marshall said the decision wasn’t taken lightly.
“In line with trying to make sure we have a merry Christmas here in South Australia, we also want to have a safe Christmas.”
Chief Public Health Officer Nicola Spurrier said the measures were to stop “another Parafield cluster”.
“My message to South Australians is with this increasing cluster in New South Wales… you must be very mindful about getting tested,” she said.
“I think we can feel quietly positive about what’s happening in New South Wales but we do need to put things in place to keep South Australia safe.”
Thirty new cases of COVID-19 were reported in NSW on Sunday.
Twenty-eight of those were linked to a developing cluster in the Northern Beaches while the remaining two are residents in the area with no known link to existing cases.
It prompted a sudden closure of the Victorian border to residents in Greater Sydney and the Central Coast, with South Australia quickly following suit.