CCL3 and COVID-19: The data are important not only because COVID-19 neutralizing antibodies were higher in the lower 50th percentile BLL group than in the upper 50th percentile BLL group, but also because circulating G-CSF, IL-8, MCP-1 and MIP-1α were higher in the upper 50th percentile BLL group than in the lower 50th percentile BLL group.