CEACAM1, CEACAM4, CEACAM6 and CEACAM8 were differentially expressed between PBMCs of COVID-19 patients and healthy controls, while CEACAM1, CEACAM6 and CEACAM8 were significantly localized in a novel cell subtype annotated as developing neutrophils, which was significantly differentiated and chemotactic (Fig. 5D, E). The gene discussed is CEACAM4; the disease is COVID-19.