Although some initial analyses on such transcriptomic datasets could identify a group of candidate gene biomarkers, such as IFI6, TIMP1, and LGR6, for COVID-19 in the previous study [13], the dataset used did not contain normal controls and only divided patients into three rough groups: patients with COVID-19, those with other viral infections, and those without viral infections. This evidence concerns the gene IFI6 and COVID-19.