Changes in levels of IFNG and CXCL10 mRNA (log2-transformed IFNG and CXCL10 fold change (FC) values) in these samples are represented in Figure 3 to illustrate the discrimination of naïve (green circles) from COVID-19 convalescent (red diamonds) participants relative to the classification threshold (dashed line). This evidence concerns the gene CXCL10 and COVID-19.