Cytomegalovirus is a virus that is universally susceptible in the general population. It has been reported that cytomegalovirus IgG antibody positivity can be detected in about 60-90% of adults, but most present in a subclinical or latent state, and the virus may only be activated when the infected person is immunocompromised or pregnant, receiving immunosuppressive therapy, having an organ transplant, or having a tumor, and cause the appearance of clinical symptoms. In addition to IgG antibodies, cytomegalovirus can also present with IgM and IgA antibodies, and only when these two antibodies are positive is it a sign of early infection and replication of the virus. a positive IgG antibody only indicates infection with cytomegalovirus, but does not mean that the disease has now developed, and only when the IgG antibody titer is more than four times normal does it indicate recent infection with cytomegalovirus.