CSF3 and hemophagocytic syndrome: In a recent report, patients with COVID-19 needing intensive care unit (ICU) admission showed a cytokine profile similar to that of secondary hemophagocytic lymphohistiocytosis with increased levels of several inflammatory cytokines [interleukin (IL)-2, IL-7, granulocyte-colony stimulating factor (G-CSF), granulocyte-monocyte stimulating factor (GM-CSF), interferon-γ-inducible protein 10 (IP-10), monocyte chemoattractant protein 1 (MCP-1), macrophage inflammatory protein 1-α (MIP1-α), and tumor necrosis factor-α (TNF-α)] (4).