A 50-year-old man from a schistosomiasis-endemic region presents with weight loss, hematuria, and lower abdominal pain. Biopsy of a bladder lesion confirms squamous cell carcinoma, and urinalysis detects Schistosoma haematobium eggs. He asks about prevention for his family. Which of the following is the most effective public health measure to reduce the incidence of Schistosoma haematobium-related bladder squamous cell carcinoma in his community?
