CCL3 and COVID-19: We found that plasma levels of cytokines IL-1β, IL-1RA, IL-7, IL-8, IL-10, IFN-γ, and MIP-1α were higher in patients who recovered from COVID-19 as compared with healthy controls and were at comparable levels to those observed in patients with COVID-19 (Figure 2A), indicating a failure to return to physiological cytokine levels after COVID-19.