DLL1 and infection: As seen in experimental infection, STRING analysis showed DEGs were enriched for immune response pathways and more specifically, pathways involved in leucocyte activation [including Notch receptor ligand delta‐like 1 (DLL1) in both adults and children, and SLAMF7 and FCER1G, the Fc receptor gamma chain (FcRγ)30 in children], regulation of immune response, complement activation and cell surface receptor signalling [including FCGR1A, the gene for the high‐affinity Fc‐gamma receptor CD64, and FCGR1B (CD64b) in children] (Supplementary figures 4 and 5c,d).