South Australia is becoming increasingly concerned with the growing number of coronavirus cases in Victoria and reports of new cases in Queensland, Premier Steven Marshall says.
SA has imposed new travel restrictions for people coming from Brisbane, the Gold Coast and nearby areas with arrivals required to get tested and isolate until they receive a negative result.
A hard border remains in place with Victoria, where 1438 new virus infections were reported on Thursday.
Mr Marshall said while it was up to everyone to make their own arrangements, it was his strong message for people to reconsider their need to travel to Queensland.
"The fact that there were six new cases in Queensland today should be ringing some alarm bells," he said.
"We will have to move quickly if we need to keep the Delta strain out of South Australia."
But the premier said while it was too early to tell what arrangements might be in place come Christmas, South Australia remained committed to ending the need for statewide lockdowns and whole-of-state lockouts.
He said the best way forward was for as many people to get vaccinated against the virus.
Mr Marshall said he expected SA to hit 50 per cent of eligible people being double vaccinated on Friday.
