The common ways of cytomegalovirus infection in adults are direct contact, blood transfusion, organ transplantation and reactivation of cytomegalovirus in the body. 1. Direct contact: The body fluids of cytomegalovirus-infected patients contain viral components, such as blood, urine, saliva and secretions, etc. Direct contact with the body fluids of infected patients may lead to cytomegalovirus infection. 2. Blood transfusion and organ transplantation: Transfusion of cytomegalovirus-containing blood products and organ transplantation from cytomegalovirus-infected patients may also lead to infection. 3. Reactivation of cytomegalovirus in the body: Once the human body is infected with cytomegalovirus, the virus cannot be completely eliminated, and reactivation of the virus may occur when the body’s immunity declines, resulting in symptoms of infection. In addition, infants are also common vertical transmission from mother to child. Cytomegalovirus infection is generally self-limiting in normal adults and does not require antiviral treatment, but in immunodeficient patients, ganciclovir and other medications should be used as prescribed by a physician. The medication should be used under the guidance of a medical professional and should not be used on its own.