A 46-year-old Caucasian male presented to the hospital in fu…

A 46-year-old Caucasian male presented to the hospital in fulminant liver failure secondary to prolonged alcohol abuse. He received a liver transplantation two days ago from an unrelated donor. His post-operative course has been uncomplicated thus far.   What type of hypersensitivity reaction is an organ transplantation patient at risk for?