GABBR2 and cytomegalovirus infection: All CMV transmissions occurred in women without gB2-specific IgG antibodies (7/55 (12.7%)), while no transmissions occurred in those with gB2-specific IgG antibodies (0/30 (0%)) (P = 0.048).<h4>Conclusions</h4>In women with a primary CMV infection treated with valacyclovir, the presence of gB2-specific IgG antibodies on immunoblot analysis identifies a subgroup with a low residual risk of maternal-fetal transmission.