CD24 and COVID-19: While our clinical cytometry data did not include band forms, a study by Morrissey et al. identified a subset of low-density neutrophils expressing CD24, DEFA3/4, ELANE, and ARG1 which was associated with severe COVID-19 and increased in severe patients over time, confirming that the cells were morphologically consistent with immature neutrophils with band-shaped nuclei4.