CCL4 and COVID-19: In our study, the levels of seven cytokines in COVID-19 patients (IL-6, IP-10, IL-8, MIG, MIP-1β, IL-18, TNF-α) were different from those in healthy controls, while M-CSF, MCP-1, FLT-3, VEGF, IL-1RA, EGF, eotaxin and MCP-1 were not different.