Interestingly, we observed that ACE2 expression was upregulated by SARS-CoV-2 (Fig. S1A) and Sendai virus (SeV) (Fig. S1B) infection in WT A549 cells, which is following the observation that the ACE2 expression was evidenced during SARS-CoV-2 infection of the respiratory epithelia in COVID-19 (12) (Fig. S1C, adapted from Nawijn and Timens [13]). This evidence concerns the gene ACE2 and infection.