Facts about CMV/HSV/Syphilis About 15% of babies with congenital CMV will not have signs at birth but will later develop hearing loss. About one out of every 200 babies is born with congenital CMV infection. CMV testing should be done within 2-3 weeks of birth to determine if it is congenital. A positive test for CMV IgG indicates that a person was infected with CMV at some time during their life but does not indicate when a person was infected. Pathogen Detection Kits Our quick, easy, and cost-effective kits are designed to rapidly identify any pathogen (virus, bacteria, fungi) in any environment. LEARN MORE