The latest South Australian case of coronavirus has been confirmed in a woman aged in her twenties.
Chief Public Health Officer Professor Nicola Spurrier said the woman was allowed to moved with her family from Victoria to South Australia on Saturday.
The move was approved because she was starting a new job.
The woman was tested in line with requirements for all people arriving from Victoria to have a test within 24 hours.
"Our system has worked ... there has been no exposure to any South Australians in terms of being a close contact," Professor Spurrier said.
"This family came straight over to a relative's house.
"There is no risk at all to the South Australian public from this case."
The woman has been moved to a "medi-hotel" where she'll have medical support, and the rest of her family remain in quarantine.
The announcement leaves South Australia with three active cases and 448 total cases.
Restrictions tighten from tonight
Another two cases were recorded in travellers who recently returned from overseas and had undertaken a quarantine period.
From midnight tonight, South Australia residents who are not essential travellers will no longer be able to cross the border from Victoria.
It's among a raft of new restrictions designed to prevent Melbourne's surging coronavirus crisis spreading west into the neighbouring state.
Victorian Premier Daniel Andrews on Monday announced 532 new cases of COVID-19 in the state, and a further 384 on Tuesday.
