Viral Hepatitis & Autoimmune Liver Disease

By completing this question set, you will be able to distinguish the five hepatitis viruses by transmission route, chronicity risk, and natural history outcome, and identify the features unique to each. You will interpret a complete hepatitis B serologic panel to determine the patient's current disease state — including the window period, resolved infection, vaccinated-only state, chronic active infection, and occult HBV. You will trace HBV natural history phases from immune tolerance through immune active phase, HBeAg seroconversion, and inactive carrier state, and explain what HBeAg-negative chronic HBV means mechanistically. You will apply the HCV serologic diagnostic pathway (anti-HCV antibody → RNA for confirmation) and explain why anti-HCV alone cannot distinguish active from resolved infection. You will identify the extrahepatic manifestations of HCV as the most frequent and diverse of all hepatitis viruses, with essential mixed cryoglobulinemia Type II as the most important. You will distinguish autoimmune hepatitis Type 1 from Type 2 by antibody profile, demographics, and target antigen. You will identify the histologic triad of AIH and explain why Wilson's disease must be excluded before diagnosing AIH in a young patient. You will distinguish primary biliary cholangitis from primary sclerosing cholangitis across every major clinical dimension — and critically, you will explain why UDCA benefits PBC but not PSC, and why PSC carries a dramatically higher cholangiocarcinoma risk.