The greatest differences were found between active TB and NoTBI contacts, with most of the markers (TGF-α, Fractalkine, IFN-α2, GRO, IL-6, IP-10, MCP-1, MIP-1a and VEGF) showing significant differences (p < 0.05 –p < 0.0001) between these two groups, except for IL-12p40, which only showed significant differences between NoTBI and LTBI (p < 0.05), and IL-16 and EGF, that did not present significant differences between groups. The gene discussed is IFNA2; the disease is tuberculosis.