Problem: A 23 y.o. man presented to the emergency room of a general hospital with a five day history of fever, jaundice, dark yellow urine, and pale-colored stools. He also complained about malaise, fatigue, abdominal pain, intermittent nausea, and vomiting. He noted loss of appetite to the point that even the sight of food made him nauseated. He denied a history of intravenous drug use and had no sexual contact for the previous two months. Five weeks ago, he attended a family reunion. Physical Examination: Vital Signs: Temperature 38.4?C Pulse 94/min Respiration 14/min Blood Pressure 124/80 mm Hg The patient was icteric with hepatomegaly but no evidence of splenomegaly. Laboratory Studies: Hct 42% WBC 8200/µL Differential normal Serum Chemistries: ALT 1240 U/L AST 1090 U/L Bilirubin 14 µmol/L No imaging studies were performed.