A comparative analysis of patients diagnosed with COVID-19, COVID-19 with concurrent maculopapular rash, or DRESS found that there were similar elevations of CXCL9, CXCL10, CXCL11, IFN-γ, IL-10, TNF-α, and IL-18 across the three groups (100). This evidence concerns the gene CXCL9 and COVID-19.