Schistosomes

A 21-year-old woman presents to a rural clinic after noticing bright-red blood in her urine earlier during the day. The patient has experienced pain with urination as well as intermittent fevers for the past two-week. Past medical history is unremarkable. The patient has lived in Egypt her entire life and is an agricultural worker. She has been sexually active with two male partners over the past year. Her temperature is 38.6°C (101°F), pulse is 88/min, and blood pressure is 108/77 mmHg. There is suprapubic tenderness. Microscopic urine analysis shows multiple ovoid-shaped organisms with a terminal spine. Which of the following is the most likely cause of this patient’s symptoms?