The Epstein–Barr virus (EBV), also called human herpesvirus 4 (HHV-4), is a virus of the herpes family, which includes herpes simplex virus 1 and 2, and is one of the most common viruses in humans. It is best known as the cause of infectious mononucleosis. It is also associated with particular forms of cancer, particularly Hodgkins lymphoma, Burkitts lymphoma, nasopharyngeal carcinoma, and central nervous system lymphomas associated with HIV. Finally, there is evidence that infection with the virus is associated with a higher risk of certain autoimmune diseases, especially dermatomyositis, systemic lupus erythematosus, rheumatoid arthritis, Sj?grens syndrome, and multiple sclerosis. LMP-1 is a six-span transmembrane protein that is also essential for EBV-mediated growth transformation. LMP-1 mediates signaling through the Tumor necrosis factor-alpha/CD40 pathway.