CCL2 and COVID-19: We found that most of the metabolic reactions within 11 metabolic pathways are upregulated in CCL2+ T cells and Group 2 macrophages in COVID-19 patients compared with those from HCs, but metabolic reaction activity is similar in CCL2+ T cells, Group 2 macrophages, and mDCs from severe and moderate COVID-19 patients (Figure 6C).