Firstly, Huang et al. reported elevated systemic IL-2, IL-6, IL-7, C-X-C motif chemokine 10 (CXCL10), chemokine (C-C motif) ligand 2 (CCL2), tumor necrosis factor-α (TNFα), and granulocyte colony-stimulating factor (G-CSF) levels in COVID-19 patients [6]. Here, CCL2 is linked to COVID-19.