This conclusion is supported, at least in part, by the results of Sukumaran and colleagues [52], who reported the upregulated expression of chemokine genes encoding CXCL1, CXCL2, CXCL3, CXCL8, CCL3, CCL4 and CCL20 after infection of PMN with Anaplasma phagocytophilum. This evidence concerns the gene CXCL2 and infection.