Cytomegalovirus (CMV) is the leading non-genetic cause of permanent hearing loss in children. 90% of CMV cases are asymptomatic at birth. They remain undiagnosed. A small number develop delayed-onset hearing loss within the first 5 years of life.This research aims to raise awareness of symptomatic CMV (cCMV) as well as informing change in public health policy with regard to asymptomatic congenital CMV (AcCMV).