Problem
Case: James is a 19-year-old who presented to the student health clinic with a 2-week history of intermittent hematuria that has become progressively worse. A urine sample was obtained. His urine revealed hematuria with red cell casts and proteinuria (5 g/day). His physical exam reveals lower extremity edema and periorbital edema. His past medical history is significant for group-A beta-hemolytic streptococcus pharyngitis 3 weeks ago; he was treated with amoxicillin but can't remember if he finished the entire prescription.
a) Based on the above history and diagnostic results, what is the most likely diagnosis?
b) What type of hypersensitivity is related to this diagnosis?
c) Discuss the pathogenesis related to the above hypersensitivity.