Graft rejection can be classified into three main types:
Hyperacute Rejection: Occurs within minutes to hours after transplantation, primarily due to pre-existing antibodies against the donor tissue. Acute Rejection: Develops within days to months and involves T cell-mediated immune responses. Chronic Rejection: Takes months to years to develop and involves both antibody and cell-mediated responses, leading to long-term graft deterioration.
