Results showed that the there was a significant correlation between the ACE2-rs4646994 I/D genotypes with respect to the age of the COVID-19 patients (p < 0.035), COVID-19 patients having T2D (p < 0.0013), COVID-19 patients having hypertension (p < 0.0031), COVID-19 patients having coronary artery disease (p < 0.0001) (Table 5). This evidence concerns the gene ACE2 and type 2 diabetes mellitus.