Nerdy Science Blog

Phyorg.com:

Demi-Lee Brennan was aged nine and seriously ill with liver failure when she received the transplant, doctors at a top Sydney children’s hospital told AFP.

Nine months later they discovered she had changed blood types and that her immune system had switched over to that of the donor after stem cells from the new liver migrated to her bone marrow.

She is now a healthy 15-year-old, Michael Stormon, a hepatologist treating her, told AFP. He said he had given several presentations on the case around the world and had heard of none like it.

Could it be another soul living inside her blood? LOL!