Bacterial Infections USMLE Step 1 Practice Question
A 44-year-old slaughterhouse worker presents with fever (38.9°C), tachycardia (HR 102), tachypnea (RR 22), and dry cough. He reports right upper quadrant discomfort and handled stillborn goats days earlier. Vital signs reveal BP 128/76 mmHg and SpO2 96% on room air. Chest radiograph demonstrates patchy interstitial infiltrates. Laboratory studies show elevated transaminases (AST 187 U/L) and normal bilirubin. He denies rash. Which organism is most likely responsible?
Answer choices
- ACoxiella burnetiiCorrect answer
- BFrancisella tularensis
- CLeptospira interrogans
- DChlamydophila psittaci
- EBrucella melitensis
- FMycobacterium tuberculosis
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.