The type of rejection that occurs within minutes to hours due to preformed antibody is known as:

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Hyperacute rejection is a type of rejection that occurs within minutes to hours due to preformed antibodies that react with the transplanted organ. This type of rejection is rare but can be catastrophic and irreversible. It occurs when the recipient has pre-existing antibodies against the donor tissue, usually as a result of a previous transplant, blood transfusion, or pregnancy. The antibodies bind to the donor organ and activate the complement system, leading to rapid destruction of the organ.

The Type of Rejection That Occurs Within Minutes to Hours