IFNG and COVID-19: Specifically, the levels of IFN-γ, interleukin (IL)-1β, 2, 4, 6, 8, 10, and 17, induced protein 10 (IP10), monocyte chemoattractant protein-1 (MCP-1), granulocyte-colony stimulating factor (G-CSF), and tumor necrosis factor α (TNFα) are significantly elevated in patients with severe COVID-19, compared to non-severe cases [1, 2, 6, 7, 21].