Many known signature-genes identified for COVID-19 (IFI27, OLFM4), RSV-LRTI (SIGLEC1, ISG15, IFI44) and PTB (MMP8, MMP9, DEFA1, DEFA1B, DEFA3 and DEFA4) are known to be associated with progressive severity87, showing the reproducibility of our findings. The gene discussed is DEFA1; the disease is COVID-19.