IL7 and COVID-19: Increased serum concentration of interleukin (IL)-2, IL-6, IL-7, granulocyte-colony stimulating factor, interferon-γ inducible protein 10, monocyte chemoattractant protein-1, macrophage inflammatory protein 1-α, tumor necrosis factor (TNF)-α, and ferritin have been observed in individuals infected with COVID-19 [46,47].