Facts about CMV/HSV/Syphilis 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 10% of babies with congenital CMV have signs, such as jaundice, rash, microcephaly, or low weight, at birth. Over half of adults have been infected with CMV by age 40. 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