<正>Objective To compare eficacy and safety of porcine antihuman lymphocyte immunoglobulin(pALG)and rabbit antithymocyte immunoglobulin(rATG)as a part of alternative donor allogeneic hematopoietic stem cell transplantation(AD allo-HSCT)for severe aplastic anemia(SAA).Methods The clinical data of 46 SAA patients