Visitors to a number of popular shopping centres in suburban Adelaide are being asked to get tested immediately, after a man breached quarantine.
Pop-up testing clinics will be operating at two supermarkets at the centre of the breach from Sunday afternoon.
There are no new cases recorded in the state but chief health officer Nicola Spurrier says she is disappointed with the man's actions.
"When I spoke yesterday my initial understanding was that the case was in quarantine and certainly they were considered a casual contact at the Intensive English Language Institute," she said on Sunday.
"But unfortunately they did not spend the whole time in quarantine and at one point they were out and about on one particular day."
People who on Sunday November 22 visited Big W Brickworks, Torrensville (12.15 pm - 12.50 pm), Foodland Norwood (1.20 pm - 2 pm) and Kmart, Kurralta Park (2.45 pm -3.10 pm) are being asked to get tested ASAP.
The man visited a number of other locations for a shorter period and those there at the same time are being asked to get tested if they have symptoms:On The Run, Hilton (12.05 pm - 12.15 pm), Anaconda, Mile End (12.55 pm - 1.05 pm), Guzman y Gomez, Glandore (2.45 pm - 2.50 pm) and Glenelg Boost Juice Shop (3.20 pm - 3.30pm).
The clinics will be operating at Kmart Kurralta Park and the Big W Brickworks for as long as necessary.
Health officials will work with businesses and use credit card details and loyalty program information to assist with the testing effort.
The planned increase of gatherings to 150 guests will go ahead as planned on Tuesday, but Prof Spurrier is asking hosts and venue owners to tell those who may be at risk to stay at home if they haven't returned a negative test.
Masks will also be mandatory in health care facilities from Tuesday onwards.
They remain recommended for the general public.
Earlier South Australian authorities issued a quarantine alert for people who attended the Intensive English Language Institute at Flinders University between November 13 and 28.
Anybody who visited the Adelaide campus and those in their immediate household must self-quarantine for 14 days under the health department directions.
Authorities are also asking anybody who visited the Flinders University Sturt Campus over the same time to get tested as soon as possible.
The directive follows the identification of a man in his 30s on Saturday who contracted the virus while attending a class at the institute.
He and a child from the original family at the centre of Adelaide's Parafield cluster were SA's two newly diagnosed cases announced.
The child was already in quarantine and posed no risk to the public, Prof Spurrier said.
She said the student and his family were also in quarantine before testing positive but his infection validated the decision to ask casual contacts to self-isolate.
Australian Associated Press