CCL3 and infection: Recruitment of EGR1+ monocytes from bone marrow to peripheral blood and transition to CCL3+ monocytes were also observed in scRNA-seq data on PBMCs from healthy donors, hospitalized patients with severe influenza, asymptomatic, mild or severe COVID-19 in the acute phase32 (Supplementary Fig. S11a–e), suggesting the wide presence of bone marrow myeloid recruitment and transition to CCL3+ monocytes after infection.