It comes within days of Police Commissioner Grant Stevens and Opposition Leader Peter Malinauskas also testing positive to COVID, with both forced into home quarantine.
In a statement late on Saturday Marshall said: “Today I learned that my daughter has tested positive to COVID-19.”
“I had dinner with her Thursday night and am therefore a close contact.
“I have gone straight to get a PCR test at one of our many testing sites and will undertake my seven-day isolation period, as so many South Australians are also doing.
“I have no symptoms and am feeling well. I will continue to chair the daily Covid Ready Committee meetings and continue to lead our pandemic response.”
Marshall thanked “all South Australians who are doing the right thing and isolating if they have COVID or are a close contact”.
It comes on a day the state posted another new record caseload of 4274, with five new deaths linked to the disease.
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