A "very unwell" toddler has been taken to an Adelaide hospital after he tested positive to Covid-19.
The 2-year-old boy returned to Australia with his family and was taken to the Women's and Children's Hospital.
He was the only person to return a positive coronavirus test on Thursday.
South Australian chief public health officer Nicola Spurrier said his family members had returned negative results "at this stage".
But as the child was not wearing a mask while on the repatriation flight, she said authorities were "a little more anxious" about the possible spread on the aircraft.