GASTROENTEROLOGY
Etiology
Hepatitis A, B, C, D, E viruses
Transmission: fecal-oral (A,E), blood/body fluids (B,C,D)
Pathogenesis
Viral replication → hepatocyte injury → inflammation
Chronicity common in HBV & HCV
Diagnosis
LFTs (AST/ALT ↑)
Serology (HBsAg, anti-HCV, etc.)
Treatment
HAV/HEV: supportive
HBV: antivirals (tenofovir, entecavir)
HCV: direct-acting antivirals (curative)