Bacterial Infections USMLE Step 1 Practice Question
A 12 year old boy is brought to the clinic in July because of fever, severe headache, and myalgias after a camping trip in North Carolina. On examination he has a blanching rash on the wrists and ankles that has spread centrally to involve the palms and soles. Which of the following is the most likely causative organism?
Answer choices
- ATreponema pallidum
- BCoxiella burnetii
- CBorrelia burgdorferi
- DEhrlichia chaffeensis
- ERickettsia rickettsiiCorrect answer
- FRickettsia typhi
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.