Mice and rat control

Urban rodents are not immune from the diseases they spread, nor are they free from fleas; however, we do not use inhumane methods of mice and rat control; we do not poison them; we do not afflict them with deadly diseases. How do we control them? Our customized fleas attack only wild rodents and only if they enter human areas, and theses fleas carry a pathogen whose only symptom is infertility.