Significant levels of macrophage chemo-attractants such as CXCL10 and CCL2/MCP-1, as well as neutrophil chemo-attractants like CXCL2 and CXCL8, enhance immune cell migration to the site of infection, which is consistent with mononuclear cell infiltrates in COVID-19 patients’ lung tissues (12). Here, CXCL10 is linked to infection.