In other studies using inhaled IFN-α-2b, relatively short shedding times have been reported such as respectively in Shenzhen, China for moderate forms of COVID-19 (percentage of SARS-CoV-2 negative shift: 66% on day 6 and 95% on day 15) (Yuan J. et al., 2020) and in Shanghai, China for mild forms (90% on day 7) (Chen J. et al., 2020). This evidence concerns the gene IFNA2 and COVID-19.