Diphtheria (D), Tetanus (T), Pertussis (Acellular, Component) (Pa), Hepatitis B (Rdna) (Hbv), Poliomyelitis (Inactivated) (Ipv) And Haemophilus Influenzae Type-B (Hib) Conjugate Vaccine(Glaxosmithkline Plc)

BEATRIX (group B strEptococcus mATeRnal and Infant VaX study) The purpose of this study is to learn about the safety and how the group B streptococcus (GBS) vaccine works in pregnant women and their babies.
This study is seeking healthy pregnant participants:
* aged 49 or younger who can join.
* between 24 and 36 weeks of gestation ("Gestational age" is a medical term used to describe how far along your pregnancy is)
* had a fetal ultrasound examination performed with no major fetal abnormalities observed
* documented negative for HIV, syphilis and Hepatitis B All participants in this study will receive only 1 shot in an arm. This could either be a group B streptococcus 6-valent polysaccharide conjugate vaccine (GBS6) or placebo. Placebo is an inactive substance used in the study for comparison purposes; in this study, the placebo injection will be saline (saltwater). The pregnant participants may take part in this study for a maximum of 14 months (6 months after delivery) , and their babies for about 12 months after they are born. The pregnant participants will need to visit the research site at least 3 to 4 times with some visits permitted to occur over the telephone.
A subset of infants will be asked to take part in the study for up to 19 months. The subset will receive diphtheria toxoid-containing vaccine and/or pneumococcal vaccine following each country's standard immunization plan and have blood drawn 1 month after completion of the primary and/or toddler (booster) doses.