CCL2 and bacterial infectious disease: The serum IL-1Ra levels of the patients with bacterial infections correlated positively with IL-6 (r = 0.635; P = 0.014), IL-8 (r = 0.671; P = 0.001), TNF-α (r = 0.701; P = 0.001), MCP-1 (r = 0.671; P = 0.001), and MIP-1β (r = 0.614; P = 0.04).