Medawar 's work resulted in a shift of emphasis in the science of immunology from one that attempts to deal with the fully developed immunity mechanism to one that attempts to alter the immunity mechanism itself . Various ways have been found to suppress the body 's rejection of organ transplants . Medawar 's work resulted in a shift of emphasis in the science of immunology from one that attempts to deal with the fully developed immunity mechanism to one that attempts to alter the immunity mechanism itself , as in the attempt to suppress the body 's rejection of organ transplants .