IL2 and COVID-19: The plasma levels of inflammatory mediators, such as interleukin-2 (IL-2), IL-7, IL-10, interferon-gamma-inducible protein-10 (IP-10), granulocyte colony-stimulating factor, macrophage inflammatory protein-1α, tumor necrosis factor-α and monocyte chemoattractant protein 1, are significantly higher in patients with severe COVID-19 than in those with mild disease [5].