What does the term "Graft versus host disease" mean? Immunologic reaction involving the attack of host cells by donor immune cells.
Bone marrow graft-vs.-host disease comes in an acute and a chronic form. The acute form appears within two months of the transplant; the chronic form usually appears within three months.
Graft-vs.-host disease is an immune attack on the recipient by cells from a donor.
The Oxford dictionary defines Chronic as, when referring to an illness, persisting for a long time or constantly recurring.
The only transplanted tissues that house enough immune cells to cause graft vs. host disease are the blood and the bone marrow.