Analysis of plasma from patients with COVID-19 has revealed increases in cytokines, including IL-1β, IL-2, IL-6, IL-7, IL-10, TNFα, monocyte chemoattractant protein (MCP1/CCL2), granulocyte colony stimulating factor (G-CSF), and macrophage inflammatory protein 1α (MIP1α/CCL3). Here, CSF3 is linked to COVID-19.