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An Australian teenager has become the world's first known transplant patient to change blood groups and take on the immune system of her organ donor, doctors said on Friday, calling her a "one-in-six-billion miracle."

Demi-Lee Brennan, now 15, received a donor liver when she was nine years old and her own liver failed.

"It's like my second chance at life," Ms. Brennan told local media, recounting how her body achieved what doctors said was the holy grail of transplant surgery. "It's kind of hard to believe."

Her body changed blood group from O negative to O positive when she became ill while on drugs to avoid rejection of the organ by her body's immune system.

Her new liver's blood stem cells then invaded her body's bone marrow to take over her entire immune system, meaning the teen no longer needs anti-rejection drugs.

Doctors from Sydney's Westmead Childrens' Hospital said they had no explanation for Ms. Brennan's recovery, detailed in the latest edition of The New England Journal of Medicine.

"There was no precedent for this having happened at any other time, so we were sort of flying by the seat of our pants," Michael Stormon, a pediatric hepatologist, told local radio.

Stuart Dorney, the hospital's former transplant unit head, said Ms. Brennan's treatment could lead to breakthroughs in organ-transplant treatment, because normally the immune system of recipients attacks the transplanted tissue.

"We now need to go back over everything that happened to Demi-Lee and see why, and if it can be replicated," Dr. Dorney said.

"We think because we used a young person's liver and Demi-Lee had low white blood cells, that could have been a reason," he told the Daily Telegraph newspaper.

Rejection is normally treated with a combination of drugs, although chronic rejection is irreversible.

Only seven in 10 transplant operations in Australia are successful after a five-year period owing to rejection complications.