Comparison of antimouse and antihorse antibody production during the treatment of allograft rejection with OKT3 or antithymocyte globulin.

Antimouse antibody is produced from 40 to 68% of the time after administration of Orthoclone OKT3. In patients treated with OKT3, however, if the concomitant immunosuppression is not decreased, the incidence of the antibody production is reduced to 40%. Similarly, 33% of patients developed antihorse antibody after the initial antithymocyte globulin (ATG) administration. Most of the time, the antibody production is low-titered for both OKT3 and ATG.