IFNG and tuberculosis: Other immunological markers than interferon-gamma (IFN-γ), such as interleukin-2 (IL-2), interferon-inducible protein-10 (IP-10) and monocyte chemotactic protein 2 (MCP-2), have been suggested as more sensitive for detecting active TB [14], [15], [16] and LTBI [17], [18].