Regarding the production of monocyte- and neutrophil-recruiting chemokines, a high expression of CCL2, CCL3, CCL4, CCL7, CCL8, CXCL1, CXCL2, CXCL3, and CXCL8 was observed, while the T cell recruiting CXCL9 and CXCL16 chemokines were less expressed by monocyte-macrophages in BALFs of severe COVID-19 than those of mild cases [85]. The gene discussed is CXCL9; the disease is COVID-19.