____ occurs at the time of transplantation and usually is a result of a mismatch of the major antigens, similar to administering the incorrect blood type to a patient.

Question

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Hyperacute transplant rejection occurs at the time of transplantation and is caused by pre-existing antibodies in the recipient that react with the donor organs due to a significant mismatch of the major antigens. It can occur within minutes to hours after transplantation and can lead to graft loss.

____ Occurs at the Time of Transplantation and Usually Is