The present invention is directed to fusion proteins, antigen cocktails and immunological compositions such as vaccines against infections caused by virulent mycobacteria, e.g. by Mycobacterium tuberculosis, Mycobacterium africanum, Mycobacterium bovis, Mycobacterium microti, Mycobacterium canettii, Mycobacterium pinnipedii or Mycobacterium mungi. The fusion proteins or antigen cocktails are based on ESX secreted or associated proteins e.g. proteins secreted by the ESAT-6 secretion system 1 (ESX-1) which are among the most immunodominant M. tuberculosis (MTB) antigens.
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