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Review Question - QID 109393

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QID 109393 (Type "109393" in App Search)
A 61-year-old-male underwent deceased donor liver transplantation 3 weeks ago. During his follow up visit he complains of nausea and abdominal pain. He has been taking all of his medications as prescribed. He has a history of alcohol abuse and his last drink was one year ago. He does not smoke cigarettes and lives at home with his wife. On physical examination temperature is 98.6°F (37°C), blood pressure is 115/80 mmHg, pulse is 90/min, respirations are 18/min, and pulse oximetry is 99% on room air. He has scleral icterus and a positive fluid wave. Liver function tests are as follows:

Alkaline phosphatase: 110 U/L
Aspartate aminotransferase (AST, GOT): 100 U/L
Alanine aminotransferase (ALT, GPT): 120 U/L
Bilirubin total: 2.2 mg/dL

Liver biopsy shows mixed dense interstitial lymphocytic infiltrates in the portal triad. What is the mechanism of this reaction?