A woman with very extensive bums (of over 75 per cent TBSA and 45 per cent full skin thickness) received cyclosporin to extend the survival of skin allografts obtained from several unmatched donors. The patients' wounds appeared completely healed after 3 months when the cyclosporin was discontinued. During the immunosuppressive treatment with cyclosporin there was no evidence of graft rejection or any side effects related to cyclosporin, Twelve days after discontinuing the drug rejection started. The bums were then successfully covered with autografts during two operations. The late functional results were excellent.