IL6 and tuberculosis: 2) Compared with healthy donors, the plasma levels of TNF-α were significantly higher in all 3 types of TB patients; IL-6 showed elevated expression in TP patients alone; the plasma levels of MCP-1 and IL-1β were only increased in PTB patients; and IP-10, MIP-1β, and IFN-γ levels increased markedly in PTB and TP patients.