Herpevac Neonatal Substudy

The primary objective of this study is to quantitate HSV-2 binding and neutralizing antibody titers in the sera of newborns delivered by HSV-uninfected women vaccinated with either two or three doses of GSK candidate vaccine gD2t/alum-MPL and to compare the HSV-2 binding and neutralizing antibody titers of the newborns to those of their mothers. Secondary objectives are to: 1) evaluate the durability of HSV-2 binding and neutralizing antibody titers in the sera of newborns delivered by HSV-uninfected women vaccinated with either two or three doses of GSK candidate vaccine gD2t/alum-MPL; and 2) quantitate hepatitis A binding antibody titers in the sera of newborns delivered by women vaccinated with either two or three doses of Havrix® hepatitis A vaccine (the control vaccine used in the Herpevac Trial for Women), compare hepatitis A binding antibody titers of the newborns to those of their mothers, and evaluate the durability of hepatitis A binding antibodies in these newborns. The sample size for this study cannot be determined but based on experience is not likely to be more than 50 women. Optional additional blood will be collected from the mother and her infant at 2 mos and 6 mos after delivery.