M1 macrophages have the ability to recruit granulocytes, NK cells, Th cells, and other macrophages to the site of infection through the secretion of inflammatory chemokines, including the monocyte chemoattractant protein 1 (MCP-1), CXCL10, CCL2, CCL5, CXCL8, and CXCL9. This evidence concerns the gene CCL2 and infection.