Definition of Disease, graft-versus-host

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Disease, graft-versus-host: Graft versus host disease (GVHD) is a rare disorder that occurs when the immune cells from donated bone marrow stem cells or a blood transfusion attack the recipient. The only transplanted tissues that contain enough immune cells (specifically T-lymphocytes) to cause GVHD are the blood and the bone marrow. This condition typically occurs in patients who have extremely weakened immune systems. Also called GVHD.