A positive cytomegalovirus IgM means that the infection is cytomegalovirus and that the infection is recent and is now in the acute phase of infection and is clearly infectious. Because IgM is relative to IgG, if IgG is positive, it means that the infection was previous and may not be significantly infectious now. Cytomegalovirus is a herpes virus that has a certain degree of impact on health. However, in adults, the effect is relatively minor and does not cause significant disease. Women who have cytomegalovirus infection during pregnancy, especially during the acute phase of infection, need to have their pregnancy surgically terminated after detection. This is because cytomegalovirus has a major impact on fetal development, mainly on the development of hearing and the central nervous system. The infection does not necessarily infect and affect the fetus, but to avoid risks, termination of pregnancy is generally recommended. If you want to continue the pregnancy, you need to evaluate the effect on the fetus by amniocentesis at 20 weeks of pregnancy and decide whether to continue the pregnancy.