In addition, an increase in IL-2, IL-7, granulocyte colony-stimulating factor (G-CSF), interferon-inducible protein 10 (IP-10), monocyte chemotactic protein 1 (MCP-1), macrophage inflammatory Protein-1α (MIP-1α) characterize the more severe phenotypes of COVID-19 (Mehta et al., 2020[47]). Here, CCL2 is linked to COVID-19.