Facts about CMV/HSV/Syphilis 1 out of 3 pregnant women who become infected with CMV will pass it on to their unborn child. 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. 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. 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