The study also found that a test consisting of six cytokines (Null-IFN-γ, Null-IL-8, CD3-IL-6, CD3-IL-8, CD3-IL-13, and ZYM IL-1β) discriminated TB from TBI with a sensitivity of 73.9% and a specificity of 100%. This evidence concerns the gene CXCL8 and tuberculosis.