The only currently available vaccine against TB, Mycobacterium bovis bacillus Calmette-Guérin (M. bovis BCG), induces CD4+ and CD8+ T cell responses in new-borns [21]–[23] and protects them from disseminated forms of disease; but it does not induce consistent protection against pulmonary TB, especially in adults [24]. Here, CD8A is linked to tuberculosis.