Cytomegalovirus is a DNA virus of the herpesvirus group. Cytomegalovirus infections in women occur for several reasons: mother-to-child transmission, sexual transmission, horizontal transmission, and medical transmission. 1. Mother-to-child transmission: Cytomegalovirus infection can occur at any stage of pregnancy. It is mainly through the placenta, blood, breast milk, saliva and secretions of the birth canal that can cause intrauterine infection of the fetus, of which transplacental infection is the main route of infection. 2. Sexual transmission: Cytomegalovirus is often found in semen, secretions from the urinary tract and cervical secretions, and the virus can be transmitted through sexual behavior. 3. Horizontal transmission: cytomegalovirus infection can be present in salivary glands, mammary glands, kidneys and peripheral blood cells, and can be excreted with saliva, milk, urine and blood, and the most common mode of transmission is droplet transmission. 4. Medical infection: It refers to the infection through blood transfusion, organ transplantation, surgery and other ways in medical places. Especially for immunocompromised patients, cytomegalovirus infection can cause very serious adverse reactions. If you are infected with cytomegalovirus, please consult a doctor immediately to clarify the cause of the disease and carry out diagnosis and treatment under the guidance of professional doctors.