CCL2 and COVID-19: Elevated inflammatory biomarkers, such as C-reactive protein (CRP), ferritin, lactate dehydrogenase (LDH), D-dimer, IFN-γ, TNF-α, interleukin (IL)-2, IL-6, and monocyte chemoattractant protein-1 (MCP1), have been reported in severe COVID-19 patients 25, 122, 123.