Anti‐IFN‐α NAB titers showed fluctuation over time but remained elevated (median/range at T1 and T2: IFN‐α2 subtype [10667/85333‐35 TRU/mL and 867/1067‐667 TRU/mL]; natural IFN‐α preparation [1067/21333‐267 TRU/mL and 400/533‐267 TRU/mL]) in COVID‐19 patients (Fig. 4, Panels A‐D). The gene discussed is IFNA2; the disease is COVID-19.