A 32-year-old female presents to the office with fever and chills of 2 weeks' duration. She also noticed blood in her urine this morning. She has a history of recent treatment for Lyme disease while visiting her daughter in upper New York State. Although she finished the course of doxycycline prescribed by her physician, she says she does not feel better. As part of her workup, peripheral blood smear stained with Wright-Giemsa identifies red blood cells. Which of the following is most likely causing her current symptoms?

1. A)Plasmodium falciparum
2. B)Drug-resistant Borrelia burgdorferi
3. C)Plasmodium vivax
4. D)Rickettsia rickettsii
5. E)Babesia microtiGABARITO