Cytomegalovirus can infect the human body. Cytomegalovirus, also known as human herpesvirus type 5, can cause damage to the lungs and liver, and can also involve the genitourinary system, central nervous system, blood system, circulatory system, etc. It is widely infected in the population and poses a serious threat to human health. Therefore, cytomegalovirus can infect human beings. The sources of cytomegalovirus infection currently include infected patients and asymptomatic infected people. Cytomegalovirus is present in blood, sleeping fluid, tears, urine, semen, feces, cervical and vaginal secretions, and breast milk in patients. The virus can also be excreted in breast milk, saliva and urine for weeks to years. Thus cytomegalovirus can be transmitted to the fetus by means of the placenta, and horizontal, medical and sexual transmission can be achieved through saliva, urine, cervical and vaginal secretions, and semen. The diagnosis of cytomegalovirus infection requires prompt antiviral treatment.