A 24-year-old male developed gross hematuria 4 hours after fever onset. Blood pressure (BP) 120/80 mmHg. Urinary protein (++++), urinary red blood cells (RBCs) covering the entire field/HP (90% dysmorphic RBCs). Albumin 40 g/L. Immunoglobulin A (IgA) 4.2 g/L.