Similarly, CCL2 (Ccl2), a ligand for CCR2 that recruits CCR2+ inflammatory monocytes [13], as well as CXCL1 (Cxcl1), CXCL2 (Cxcl2), and CXCL5 (Cxcl5), which are ligands of CXCR2 that induce neutrophil infiltration in influenza-infected lungs [26–28], showed notable decreases in NOD.SCID mice. Here, CXCL1 is linked to influenza.