CD40LG and cytomegalovirus infection: In the present study, we showed that 46.1% (177/384) of infants born to mothers with positive CMV IgG and negative CMV IgM experienced postnatal CMV infection at the age of 10.2 ± 2.3 months, and breastfeeding and vaginal delivery each increased the mother-to-child transmission of CMV, with the OR 3.801 and 1.818 respectively.