GGT: gamma-glutamyl transpeptidase; AST: aspartate transaminase; ALT: alanine transaminase; ESR: erythrocyte sedimentation rate; INR: international normalized ratio; CRP: C-reactive protein; WBC: white blood corpuscles; ALC: absolute lymphocyte count; AEC: absolute eosinophil count; NAFLD: nonalcoholic fatty liver disease; COVID-19: coronavirus disease 2019. This evidence concerns the gene GPT and COVID-19.