Fully vaccinated South Australians will only have to quarantine for seven days if they are deemed a close contact of a COVID-19 case, under new rules when borders reopen on November 23.
Fully vaccinated casual contacts will have to isolate until their first negative test.
The state government today announced more details of the reopening plans, a week out from the opening of the borders.
However, there was a lack of detail around COVID management plans in the state's schools and quarantine requirements for unvaccinated children under the age of 12 who are exposed to positive cases.
Children under the age of 12 are still not eligible to be vaccinated.
Under the new rules outlined today, the government has changed how authorities define close and casual contacts.
The guidelines include a new category of low-risk casual contact for when someone has been in the same setting as a COVID-positive person, but has not had more than 15 minutes face-to-face contact with them.
Those people will face no quarantine or testing requirements.
However, unvaccinated people who come into contact with COVID-19 cases will still have to quarantine for 14 days.
"We know this is going to be a huge relief for families, for businesses, those state borders have been extraordinarily punishing.
"I expect that we will be at that 80 per cent [vaccinated] next week."
South Australia's double vaccination rate currently sits at just under 74 per cent.
Mr Marshall said there would be no changes to "public health and social measures" until the state reaches a 90 per cent vaccinated rate.
"But we will be very, very significantly reducing the test, trace, isolate and quarantine requirements," he said.
"But when somebody does become infected and it's inevitable that they will … need to do the 14 days of quarantine."
'There is some fine print'
The state's Chief Public Health Officer, Nicola Spurrier, said the "deep clean" protocols at COVID-19 exposure sites would also be updated.
"With time it's become very obvious, particularly with Delta, that aerosol transmission is very important and the fomite [surface] transmission is not as important, so we are changing the cleaning protocols for businesses because of that," she said.
"But it doesn't have to be that level of deep clean that some businesses have undertaken in the past and hopefully that will reduce the impact on the business and the length of time they need to close."
Professor Spurrier said she was concerned about areas with low vaccination rates, particularly the northern suburbs of Adelaide.
"I really am very concerned for those particular suburbs," she said.
"I am also concerned for our Aboriginal community, I've worked a lot in Aboriginal health.
She also acknowledged that schools are likely to be places of transmission.
"We know that because kids less than 12 can't be vaccinated they are going to become close contacts if there is an outbreak in a school, so there is some fine print," she said.
"I'm not going to go into it in detail for the journalists … but I think you will be able to find that level of information there on the sheets that we provided."
That "fine print" says children under 12 are considered unvaccinated, so will have to quarantine for 14 days if they are exposed to a COVID-19 case.
Others in their household who are vaccinated — such as parents — will not have to quarantine, but will have to undergo COVID tests on days one and six.
