A 33-year-old man in Arkansas presents to the local clinic with fever, chills, headache, and generalized myalgias and arthralgias. On physical examination, an ulcer with a black base is apparent on his right hand, and epitrochlear lymphadenopathy is noted. A careful history reveals that the man is a hunter and trapper, recently trapping and skinning rabbits. Which of the following organisms is the most likely cause of this man's illness?
A. Borrelia
B. Brucella
C. Francisella
D. Leptospira
E. Listeria
A. Borrelia
B. Brucella
C. Francisella
D. Leptospira
E. Listeria