The baseline concentration of the selected cytokines including IL-6, IL-7, IP-10, TGFα, TNFα and BCA-1 showed greater concentrations in serum from active TB patients than in their uninfected contacts (p values ranging between 0.05–0.0001) and, in the case of IP-10, TGFα and BCA-1, also compared to LTBI contacts (p < 0.05 –p < 0.01). Here, IL6 is linked to tuberculosis.