Study in Healthy Adults to Evaluate Gene Activation After Vaccination With GlaxoSmithKline (GSK) Biologicals' Candidate Tuberculosis (TB) Vaccine GSK 692342

The purpose of this study is to assess the safety and immunogenicity of two doses of the TB vaccine administered according to a 0, 1 month schedule. In, addition, blood samples collected at different time points after vaccination will be analysed to see when exactly genes are activated by the vaccine using an assay called mRNA expression profiling. The different methods for mRNA expression profiling using whole blood samples versus Peripheral Blood Mononuclear cell(s) (PBMCs), will also be compared.