Banchereau et al. reported that upon viral infection of humans, different subsets of chemokines are secreted in a temporally regulated manner, with CXCL1, CXCL2, CXCL3 and CXCL16 being secreted first to allow homing of naïve T cells, then CCL3, CCL4, CCL5, CXCL8, CXCL9, CXCL10 and CXCL11 to sustain localization of activated T cells, and finally CCL19, CCL22 and CXCL13 [35]. This evidence concerns the gene CXCL9 and viral infectious disease.