Certified Histocompatibility Specialist Practice Test

Chronic rejection is a complex immunological process that occurs over an extended period, typically months to years after transplantation, rather than immediately after the procedure. The key aspect of chronic rejection is that it is characterized by both the involvement of antibodies and T cells, leading to progressive damage to the transplanted tissue. While T cells play a significant role, chronic rejection is particularly noted for the involvement of antibodies that target the graft. This antibody-mediated component often contributes to the gradual deterioration of the graft function. Hence, stating that chronic rejection can involve both antibodies and T cells accurately highlights the multi-faceted nature of the immune response during this phase of rejection. This contrasts with other statements that suggest conditions and mechanisms not typically associated with chronic rejection. For example, chronic rejection does not occur within days of transplantation, as that's more characteristic of acute rejection, and it is not limited to kidney transplants, as chronic rejection can affect any type of transplanted organ.