A new exposure site has been identified but no new COVID-19 cases have been reported following the infection in a South Australian woman who spent time in Victoria.
The case, involving a woman in her 40s, has already prompted tough new restrictions for Mt Gambier and two other council areas in SA's southeast.
They include stricter density rules, a limit of two visitors to any home, and bans on private functions and organised sporting activities.
The rules will stay in place for at least seven days.
SA Health said on Tuesday its investigations in the Mt Gambier region were continuing but a new exposure site linked to the woman's case had been identified at the SipnSave at the South Eastern Hotel on Friday between 5.30pm and 6.05pm.
It was considered a tier four site, so anyone there at that time need only monitor for coronavirus symptoms.
After testing positive, the woman was transferred to hotel quarantine in Adelaide along with her four children.
Commissioner Grant Stevens said while contact tracers were dealing directly with the woman, police were following up on other information.
SA officials also remain concerned about another virus case in an interstate truck driver who visited service stations and truck stops at Ceduna and Port Augusta on Sunday.
The state's transition committee met on Tuesday and decided against making any changes to local virus restrictions which include mandatory mask-wearing at indoor locations, including shopping centres and some general density rules and attendance limits.
SA currently has four active COVID-19 infections, with two of those acquired interstate and two in returned overseas travellers.
No new infections were reported on Tuesday among more than 4600 tests conducted in the previous 24 hours.
