A Phase II, Multicenter, Randomized, Observer-Blind, Controlled Study to Evaluate Safety and Immunogenicity of a Trivalent Group B Streptococcus Vaccine in Healthy Pregnant Women

Evaluate the safety and immunogenicity of the trivalent group B streptococcus vaccine in healthy pregnant women. The study will also evaluate the levels of GBS serotype-specific antibodies in infants, placental transfer from the pregnant women to the infant and levels of antibodies in the breast milk.