In that regard, severely affected COVID-19 patients had higher serum levels of IL-6, IL-7, IL-10, G-CSF, M-CSF, IP-10, MCP-1, MCP-3, MIG, and MIP-1α compared to mild cases, and higher levels of MCP-3, MIG, and MIP-1α in comparison with moderate cases [7]. This evidence concerns the gene CXCL9 and COVID-19.