SERPINA1 and COVID-19: When COVID-19 patients were segregated into subgroups, amongst the patients with a moderate disease, strong correlations were found between AAT and AGP (r = 0.91, p < 0.001), HP (r = 0.79, p < 0.01), hs-CRP (r = 0.72, p < 0.01), and CP (r = 0.89, p < 0.01).