A medical intern at a hospital in western Austria mistakenly injected an elderly patient with olive oil instead of antibiotics after mixing up bedside vials, officials said Wednesday.

The patient, a 79-year-old woman who had been admitted to Steyr Hospital for an appendectomy, was not in life-threatening condition, hospital director Harald Geck told the Austria Press Agency.

The mix-up apparently happened when the intern at the hospital reached for the wrong vial and injected the patient with olive oil that had been prepared by a hospital physiotherapist for a massage, Geck said.