Antiviral medication to prevent fetal transmission of maternal CMV during pregnancy

Background. Cytomegalovirus infection represents the most frequent congenital viral infection, with serious consequences on newborns. Neurosensorial hearing loss is the principal outcome, but also, the infection can cause other central nervous system’s anomalies. Although CMV infection can have a major impact on fetal development, there are not clear directions to follow yet, to prevent or treat this condition. Therefore, our purpose with this paper is to update the knowledge regarding the treatment options in order to prevent fetal transmission of maternal CMV infection, based on the latest data from the specialized literature in this field. Methods. Electronic research and analysis of the relevant articles published mainly in the last 5 years were performed, consulting the web platforms PubMed, ScienceDirect, Mendeley and ClinicalTrials.gov. Results and conclusions. To date, there is not enough evidence to reach a consensus on therapeutic methods to prevent or to treat fetal CMV infections and, as a consequence, antenatal screening is not justified. Many pharmaceutical companies work on vaccines to prevent CMV infection, but the results are only from studies’ second phase. Information on efficiency of hyperimmunoglobulin is mixt and it is necessary to clarify the dosage. Among antiviral agents, valaciclovir, which was studied in recent clinical trials, seems to have the best efficiency to prevent fetal transmission of maternal CMV infection and the best safety profile. Valganciclovir has possible embryotoxic effects, but higher potency and information on it are available only from case reports. The interest of scientific community on this topic is high, thus many studies are underway to bring new clarifications.