Epstein-Barr Virus
Epstein-Barr virus (EBV) is a member of the Herpes virus family and one of the most common human viruses. It occurs worldwide; in the United States, as many as 95 percent of adults between the ages of 35 and 40 have acquired the virus. Up to half of people who are infected with EBV as adolescents or young adults will develop infectious mononucleosis. EBV remains dormant or latent in a few cells in the throat, blood, and immune system for life. Periodically, the virus can reactivate without symptoms of illness; in a very few carriers, a late event can be two rare cancers not normally found in the United States.