Baricitinb causes inhibition of expression of various cytokines known to be elevated in severe COVID-19, including interleukin-2, interleukin-6, interleukin-10, interferon-γ and granulocyte-macrophage colony stimulating factor.4 However, the role of baricitinib when used together with corticosteroids is not well studied. Here, CSF2 is linked to COVID-19.