In blood test panels, compared to the non-diabetic group, the diabetic group showed the worsened anemia and thrombocytopenia, the elevated levels of ALT, AST, GGT, globulin, ADA and BUN, and the exacerbated hypokalemia and hyponatremia, confirming an intensified viremic effect on COVID-19 patients owing to diabetic comorbidity. This evidence concerns the gene ADA and COVID-19.