Intriguingly, among all the tissues tested, ACE2 was highly expressed in intestine, which is consistent with previous reports (Lamers et al., 2020; Li et al., 2020), and displayed remarkably increase in lung and testis post infection, which consistent with the observations of other previous studies (Tipnis et al., 2000; Wrapp et al., 2020; Ziegler et al., 2020). This evidence concerns the gene ACE2 and infection.