A client presents with sudden onset of hematuria, variable p…

A client presents with sudden onset of hematuria, variable proteinuria, decreased GFR, oliguria, and signs of impaired renal function. Upon taking a history the nurse learns that the client had strep throat 3 weeks ago. Upon renal biopsy, the diagnosis of acute glomerulonephritis is confirmed. What mechanism of damage is the MOST plausible?