Unexpectedly, we observed an expansion in the circulation of this angiogenic neutrophil subset in COVID-19 patients at day 1 (Fig. 2d and e) and persisting at day 3 and day 7 (Fig. 2e), together with a decrease in the expression of CD49b (Fig. 2f) and VEGF-R1 (Fig. 2g and h) on the surface of angiogenic neutrophils. Here, FLT1 is linked to COVID-19.