Prospective, randomized, double-blind, multicentre, placebo-controlled clinical phase IIa trial to evaluate safety and immunogenicity of RUTI® vaccine in Multidrug-resistant Tuberculosis (MDR-TB) patients favourably responding to standard MDR-TB treatment. Time point of vaccination starts at 16 weeks upon start of standard MDR-TB treatment (cohort A), and if clinically safe as evaluated by an independent panel of experts (DSMB), another cohort of patients will be vaccinated at 12 weeks upon start of standard MDR-TB treatment (cohort B). All the patients will be followed up 8 weeks after vaccination.