Phase III, Partially Double-blind Study to Evaluate Consistency and Immunogenicity of 3 Lots of GSK Biologicals' Hib Conjugate Vaccine 208108 Versus ActHIB and Pentacel at 2, 4, 6 and 15-18 Months of Age in Healthy Infants

The purpose of this study is to evaluate safety, to demonstrate lot-to-lot consistency of the vaccine, to address the relevant concomitant vaccine administrations and to provide a comparison between GSK Biologicals' Hib conjugate vaccine and the licensed monovalent Hib vaccine ActHIB as well as the licensed combination product Pentacel in infants at 2, 4, 6 and 15-18 months of age. This study is designed with a primary and a booster phase.