EBV stands for EB virus and is a DNA virus that is widely ever infected in adults. The vast majority have no particularly obvious clinical symptoms and are even latently infected. EBV infection may also cause significant liver damage, and some of the patients with significant liver damage are also infected with this virus. It may also cause the more severe hemophagocytic syndrome, which is relatively rare clinically. The vast majority of people infected with the virus have relatively mild symptoms or insidious infection. When adults are tested for antibodies related to EBV, it is shown that many have been infected with EBV at one time or another.