IL7 and COVID-19: The increased level of some cytokines, including interleukin (IL)-1β, IL-2, IL-6, IL-7, IL-8, IL-10, granulocyte-colony stimulating factor (G-CSF), granulocyte macrophage-colony stimulating factor (GM-CSF), interferon-inducible protein-10 (IP10), monocyte chemotactic protein 1 (MCP1), macrophage inflammation protein-1α, IFN-γ, and tumor necrosis factor-alpha (TNF-α) is known as the signs of cytokines storm caused by COVID-19 (12, 13).