According to Severe Asthma Research Program-3 (SARP-3), the use of inhaled corticosteroids is linked with a decreased level of ACE2 and transmembrane protease serine 2 (TMPRSS2) gene expressions in asthmatic patients which are the key entrance receptors for SARS-CoV-2 infection [23]. Here, TMPRSS2 is linked to asthma.