There were 104 people with COVID-19 in hospital, including nine in intensive care and one on a ventilator.
Of those in hospital, 58 were fully vaccinated, 22 were either unvaccinated or partially vaccinated, and 24 had an unknown vaccination status.
All up, there were 18,150 active infections in the state on Thursday.
Premier Stevxjmtzywen Marshall said there had been a recent “bump” in COVID-19 infections, but SA Health was able to handle the number of hospitalisations.
“We’re still very much within our capacity within hospitals,” he told reporters.
“We’ve seen that remain relatively flat for an extended period of time.