Four recent travellers to South Australia may have quarantined at Brisbane's Grand Chancellor Hotel, now shut down over a COVID-19 scare.
SA Health says two people who were at the hotel and later travelled to South Australia were no longer in the state.
It said checks were still being made to confirm if two more people from the hotel had recently arrived in SA via Victoria.
The information comes after the Grand Chancellor was shut down when six people linked to the quarantine facility tested positive for the more contagious UK coronavirus strain.
A cleaner and her partner, who are among the six, were contagious while in the community and triggered a three-day lockdown in Brisbane last weekend.
Queensland Premier Annastacia Palaszczuk has now proposed a national network of outback quarantine camps to protect Australians from the UK variant.
Ms Palaszczuk says it's clearly too risky to quarantine travellers in capital cities anymore.
Queensland is instead looking to order people to quarantine in vacant regional mining camps.
SA Chief Public Health Officer Nicola Spurrier said if any people who stayed at the Grand Chancellor were found to be in South Australia, they would be required to return to quarantine.
"We do know that this is one of these new variants of concern and we know that it is more transmissible and we don't want to take any chances," she told reporters on Wednesday.
Issues over the hotel cases prompted South Australia to keep quarantine restrictions in place for all travellers from Greater Brisbane.
South Australia reported no new COVID-19 cases on Thursday, leaving the state with 11 active infections, all returned travellers in hotel quarantine.
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