Bacterial Infections USMLE Step 1 Practice Question
A 27-year-old man presents to the emergency department with fever (40.2°C), severe myalgias, headache, and conjunctival injection. He participated in a freshwater mud race 1 week ago. Vital signs show HR 105/min, BP 118/82 mmHg, RR 18/min, SpO2 98% on room air. Laboratory studies reveal total bilirubin 3.2 mg/dL, creatinine 2.1 mg/dL, platelets 95,000/μL, and normal meningococcal PCR. He denies respiratory symptoms. Which organism is most likely responsible?
Answer choices
- ARickettsia rickettsii
- BBorrelia burgdorferi
- CCoxiella burnetii
- DTreponema pallidum
- ELeptospira interrogansCorrect answer
- FHantavirus pulmonary syndrome
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