South Australia has imposed travel restrictions on parts of the Northern Territory after the discovery of a COVID-19 infection.
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The new arrangements will prevent people travelling to SA from Darwin and Katherine and other local government areas north of the Barkly local government region.
Returning South Australians and essential travellers will be allowed but must get three tests and quarantine for 14 days.
People coming from other parts of the Territory must get three tests and isolate until they receive the first negative result.
The changes follow the decision by the NT government to impose a snap three-day lockdown on the Greater Darwin region and the town of Katherine after an infection was confirmed in a US traveller who arrived last week after quarantining in Sydney.
Premier Steven Marshall said the NT situation highlighted and vindicated South Australia's decision to require anyone coming into the state from NSW to quarantine for an additional 14 days on top of any isolation period served in Sydney.
"We've been on high alert for some time now. We've come into criticism for our tight border with NSW," he said.
"But it reinforces the reason why we have that 14 days additional quarantine for people coming from NSW."
The premier said SA would continue to monitor the situation in the Territory, taking into consideration details of the new case including when the person was infectious, how much time they spent in the community and number of exposure sites.
The latest travel ban means people from NSW, Victoria, Queensland, the NT and the ACT cannot enter SA.
Also on Monday, SA began taking vaccine bookings for all people aged 16 to 39, with more than 83,000 snapping up slots in the first few hours.
Mr Marshall described the rush as an "absolute stampede" that demonstrated how keen young people were to get vaccinated.
He also confirmed SA would get 47,000 Pfizer doses from the extra supplies Australia had secured from Poland.
He said it was yet to be decided if they would be made generally available or used to target specific groups.
Chief Public Health Officer Nicola Spurrier said Australia was in a "very volatile situation" and urged more people to get tested.
She said testing rates across SA had dropped significantly since the recent cluster of local cases was brought under control.
SA reported no new virus infections on Monday and had two active cases.
Australian Associated Press
