Review Question - QID 213500

A 35-year-old man presents to the clinic with a complaint of a “tingling sensation” in his legs and feet for the past 3 months, as well as occasional diarrhea and nausea. He has been feeling more fatigued than usual when carrying out his typical weekend hobbies of hiking and backpacking. He lives in Michigan, where he spends most of his free time swimming in the lakes and engaging in water sports. He reports no recent international travel. Physical examination is notable for decreased vibratory sensation in the lower extremities and conjunctival pallor. A peripheral blood smear is obtained and is shown in Figure A. Which of the following pathogens most likely contributed to this patient’s presentation?