Similar to SARS-CoV, the entry receptor for SARS-CoV-2 was recently determined to be ACE2 (Letko et al., 2020; Zhou et al., 2020), with co-expression of transmembrane serine protease 2 (TMPRSS2) facilitating infection (Hoffmann et al., 2020). This evidence concerns the gene TMPRSS2 and infection.