Prenatal and postnatal antiviral therapies for the prevention and treatment of congenital cytomegalovirus infections.

Purpose of review: Congenital cytomegalovirus infection (cCMV) is the leading infectious cause of sensorineural hearing loss and lifelong neurodevelopmental disabilities. Studies suggest antiviral therapy can prevent fetal infection after maternal primary infection, as well as halt the progression of hearing loss and neurodevelopmental disabilities in newborns with symptomatic cCMV. With growing worldwide momentum on early detection and diagnosis of cCMV, this review describes the exciting recent advances in antiviral therapies in CMV infected pregnant mothers and babies, as well as emerging evidence on anti-CMV vaccines.

Recent findings: New opportunities for prenatal and neonatal interventions have driven a rising interest in screening and identification of asymptomatic CMV infection. Routine screening of pregnant women to identify primary infection in first trimester is now advocated in Western Europe but has yet to be examined from a public health perspective in other regions. Evidence is emerging for maternal valaciclovir therapy to prevent fetal infection after a maternal primary CMV infection in the first trimester of pregnancy. For those infants who are born with symptomatic cCMV, a 6-month course of valganciclovir, started within the first 4 weeks of life, and possibly up to 13 weeks of life, is the current recommended therapy. However, there is unclear evidence for the benefit of treatment for asymptomatic cCMV and cCMV with isolated hearing loss. Research to identify more effective antivirals and an effective CMV vaccine continues.

Summary: More research is needed to determine the region-specific applicability of the new European recommendations for routine CMV screening in pregnancy. Areas of uncertainty in postnatal management include timing of initiation, duration of treatment and identifying pediatric subgroups that benefit from modification of the standard treatment recommendations.