A 12-year-old boy from Connecticut presents with fatigue, fever, headache, fleeting joint pain, and a reddish rash on his trunk and left leg of 1 week duration (see image). He recalls having a tick bite on his leg about 2 weeks ago. There is a red macule on the site of the bite that has grown circumferentially. The organism most likely responsible is:
Select one:
a. Borrelia burgdorferi
b. Chlamydia trachomatis
c. Ricksettsia rickettsia
d. Rickettsia typhi
e. Mycobacterium leprae