Many studies have also demonstrated that angiotensin (Ang) II and other components of the RAAS, such as Ang-(1–7) and aldosterone, contribute to the inflammatory response, which suggests that the activation or blockage of the RAAS is related to the inflammatory response in patients with COVID-19 (the RAAS system is presented in Figure 1) (Di Raimondo et al., 2012; El-Hashim et al., 2012). The gene discussed is AGT; the disease is COVID-19.