CCL2 and COVID-19: Several pro-inflammatory cytokines and chemokines, interleukin (IL)-1β, IL-2, IL-6, IL-7, IL-10, tumour necrosis factor-α (TNFα), granulocyte colony-stimulating factor (G-CSF), interferon (IFN) γ-induced protein 10 (IP-10/CXCL10), monocyte chemoattractant protein 1 (MCP-1), macrophage inflammatory protein 1α (MIP-1α/CCL3), have been detected in the bloodstream and target tissue of COVID-19 patients1,3,5.