CCL2 and COVID-19: COVID-19 is characterized by cytokine storms, and patients are positive for cytokines, such as monocyte chemoattractant protein 1 (MCP1), macrophage inflammatory protein (MIP)1α, interleukin (IL)-6, IL-2, IL-7, IL-10, and tumor necrosis factor alpha (TNF-α) [7, 8].