Among viral infections cytomegalovirus infection is the most common. Cytomegalovirus is a common herpesvirus with a positive rate of 30%-97% in human sera. Cytomegalovirus infection in immunocompetent people usually presents with a short period of fever or no symptoms, after which the cytomegalovirus is in lifelong latency in a variety of cells and becomes a store for reactivation, and carriers become susceptible. Cytomegalovirus infection is mostly invisible when the immune status of the body is good. Cytomegalovirus infection can cause harm to the human body through both direct and indirect effects, as follows: 1. Direct effects: Cytomegalovirus infection or reactivation of the virus in the latent state can lead to cytomegalovirus syndrome or end-organ disease after dissemination into the blood. 2. Indirect effects: Cytomegalovirus increases the risk of infection by other pathogens, such as bacteria, fungi and other viruses, by affecting the function of the immune system. and other viral infections. Cytomegalovirus antibody testing, mainly detecting cytomegalovirus IgG and IgM in serum, is as follows: 1. Serum cytomegalovirus IgG: its positivity only indicates a history of previous recessive or dominant form cytomegalovirus infection and is of little value for the diagnosis of clinical cytomegalovirus disease, but can be used as the main basis for stratification of cytomegalovirus hazard. 2. Serum cytomegalovirus IgM: this is a recent retrospective index of cytomegalovirus infection. If the cytomegalovirus IgM is progressively elevated in a short period of time, it mostly suggests that the patient has had cytomegalovirus infection recently, which helps in the retrospective clinical diagnosis. In addition, the common anti-cytomegalovirus drugs, such as valganciclovir, valacyclovir, phosphoinositide, and cidofovir.