SA Health said test results received late yesterday had confirmed that the Eynesbury College student has the Human Swine Influenza, Influenza A (H1N1).

She was treated with antivirals when she visited a general practitioner on Tuesday.

Two other family members had mild respiratory symptoms and were also given antivirals as a precaution. It was not yet known if they have the virus, and the family is in home isolation. No other details about their identities was released.

A seven-day isolation order was issued for all college students and teachers, requiring all of them to stay in their homes. There are about 40 other children in the student's year 10 class.

The Health Department has confirmed that the infected student had recently revalled interstate, but details of where she went are not available.