CCL2 and infection: These molecules attract more innate immune cells, such as polymorphonuclear leukocytes, monocytes, NK cells, DC cells, which in turn produce other factors, such as Monokine Induced by Gamma interferon [22], Interferon gamma-induced Protein 10 (IP-10) and Monocyte Chemoattractant Protein 1 (MCP-1), attracting lymphocytes at the site of infection (Figure 2) [9,23,24].