A petrol station in regional South Australia is a potential third COVID-19 exposure site, linked to virus-infected removalists who travelled to SA from Sydney.
Deputy Chief Public Health Officer Emily Kirkpatrick says the site is still being pinpointed, but it's now believed the removalists stopped for rest and fuel after crossing into SA from Victoria early on Friday, July 9.
Dr Kirkpatrick says CCTV footage is being checked and other investigations are underway, and as soon as the location is confirmed details will be released.
"The route coming into South Australia is still being worked through in terms of where those exact stops were," she said.
"It has been a very difficult process piecing together where these particular removalists have been."
However, Dr Kirkpatrck said there had been no confirmed local coronavirus cases linked to the two sites of concern already identified, a service station and a cafe at Tailem Bend, about 100 kilometres east of Adelaide, where the removalists stopped on their return journey.
About 90 people are currently in isolation being considered close or casual contacts in relation to the two locations after two of three removalists, who relocated a family from Sydney to McLaren Vale, tested positive for coronavirus.
So far, all those people considered close contacts of the two men have returned negative tests.
The family of four who relocated to SA have also twice tested negative and are not showing any symptoms despite having contact with the removalists over a five-hour period earlier this month.
Premier Steven Marshall said while all the negative tests were good news, there was still a way to go.
"It's a sigh of relief, but obviously we know the incubation period for this disease can be 14 days and in fact in some cases, it can be even longer," he said.
"So we're not out of the woods."
Dr Kirkpatrick has also given details of a possible case of COVID-19 transmission in a quarantine hotel in Adelaide.
She said a man in his 40s had tested positive for the virus after being located close to another positive case.
That earlier case was thought to have been an old infection, but was now being reviewed.
As a result of the latest positive test, about five people in the hotel have had their quarantine periods extended while a number of people recently released were being contacted and would be tested again.
Mr Marshall said South Australia was not considering any further local virus restrictions in response to the potential for local cases.
However, the state has tightened the rules for people returning from Sydney, requiring everyone to apply for a special exemption.
About 950 returned last week, but authorities hope the new rules will significantly reduce that number.
SA is also reviewing arrangements with Victoria, after the reporting of new local infections in Melbourne.
