Secondary allograft rejection is mediated by: (A) Memory cells, (B) Antibodies, (C) Immune complexes, (D) None of the above
Answer is A. Answer- A. Memory cellsAfter hlperacute rejection, transplantation of a second gfaft, which shares a significant number of antigenic determinants with the first one, results in a rapid (2 - 5 days) rejection. It is due to presence of T-lymphocyte sensitized during the first graft rejection(memory cells).