Allograft rejection is an example of?
Ans. (b) Delayed type hypersensitivity(Ref: Robbins 9th/pg 231-234; 8th/pg 221-229; Refer Ans 200)Types of Rejection Pathway:Direct pathway: CD4 and CD8-T cells of the transplant recipient recognize allogeneic (donor) MHC molecules on the surface of APCs in the graft.Indirect pathway: recipient CD4-T lymphocytes recognize MHC antigens of the graft donor after they are presented by the recipient's own APCs.As both the pathways are cell mediated, hence they are delayed hypersensitivity reactions.
GVHD
Delayed types hypersensitivity
Immediate hypersensitivity
Acute rejection
Immunity