A study to compare the immunogenicity & safety of 2 formulations of GlaxoSmithKline (GSK) Biologicals' DTPa-HBV-IPV/Hib vaccine given in healthy infants at 3,4 & 5 months age. The immunogenicity & safety of DTPa-HBV-IPV vaccine will also be evaluated in a 3rd group of subjects Subjects in the group that will receive DTPa-HBV-IPV/Hib vaccine (current formulation) will be the control group for the group that will receive DTPa-HBV-IPV/Hib vaccine (new formulation)
In this study, infants will be randomly allocated into three groups:~one group of subjects will receive DTPa-HBV-IPV/Hib vaccine (new formulation)~the second group of subjects will receive DTPa-HBV-IPV/Hib vaccine (current formulation)~the third group of subjects will receive DTPa-HBV-IPV vaccine The study will be double-blind for the two groups receiving the DTPa-HBV-IPV/Hib vaccine (new or current formulation). The study will be single-blind for the group receiving DTPa-HBV-IPV vaccine.