CCR2 and tuberculosis: To further explore the regulation of leukocyte traffic during this disease, we measured plasma levels of MCP-1, CCL-17, IL-8, and IP-10, ligands of CCR2, CCR4, CXCR1, and CXCR3 receptors, respectively, in patients with MDR-TB and DS-TB (Figures 8(a)–8(c)).