CCL2 and COVID-19: Huang et al. (2020) reported that patients with COVID-19 had increased serum levels of proinflammatory cytokines such as IL-2, IL-6, IL-7, IL-10, TNF-α, monocyte chemoattractant protein 1, granulocyte colony-stimulating factor, IFN-γ-inducible protein 10, and macrophage inflammatory protein 1.