Compared to healthy individuals, patients had higher proportions of Th17 cells either circulating (1.56 vs. 0.96%, P < 0.001) or infiltrating the liver (16.08 vs. 0.82/hpf, P < 0.001); associated with higher serum IL-17 levels (84.86 vs. 60.52 pg/mL, P < 0.001). Both (circulating and intrahepatic) Th17 cells correlated with the severity of liver inflammation and damage. Here, IL17A is linked to Hepatitis.