Of note, IL-10 is one of the cytokines downstream ACE2 pathway [25] and is significantly upregulated in the most severe forms of COVID-19 [2,8,9], indicating an important correlation between ACE2/Ang (1–7) axis activation and IL-10 upregulation which might lead to eosinopaenia/lymphopaenia in COVID-19 patients. This evidence concerns the gene ACE2 and COVID-19.