IFNG and tuberculosis: Intriguingly, we defined the cut-off value of 22.78 pg/ml for MCP-2/CCL8 and of 14.75 pg/ml for IFN-γ; sensitivity and specificity of MCP-2/CCL8 for TB-PEs were both 100%, and thus superior to diagnostic accuracy of IFN-γ with sensitivity of 100% but specificity of 91.7% for TB-PEs.