Infection from a common virus, cytomegalovirus (CMV), is the leading cause of non-genetic hearing loss in U.S. newborns. Even though the virus is far more prevalent than Zika, it remains relatively unheard of. ENT specialist Dr. Albert Park explains what can happen when infants are exposed to CMV while in the womb and steps that pregnant women can take to avoid infection. Park is carrying out a national clinical trial to determine whether he can lessen the impact of CMV in infants by treating them with antiviral medications.