CCL2 and COVID-19: Despite the pulmonary injury, the production of pro-inflammatory cytokines including IL-1β, IL-6, TNF-α, macrophage inflammatory protein 1-α, interferon gamma-induced protein-10, and monocyte chemoattractant protein-1 were significantly enhanced in COVID-19 patients (Huang et al., 2020; Liu et al., 2020).