A one-off injection of cells could be a long-sought solution to the problem of the body rejecting an organ transplant .

The first person who may have benefited from this approach is an Italian man who had a kidney transplant . He has been completely tolerating his new organ for 19 months without anti-rejection medicines.

Transplants can be life-saving, but to stop the donor organ being rejected by the recipient’s immune system, people have to take several drugs that have serious side …