Bacterial Infections USMLE Step 1 Practice Questions
58 board-style USMLE Step 1 questions in Infectious Disease. Each question shows the correct answer; create a free account for the full explanation and adaptive practice.
- USMLE Step 1 · hard · image1. A 62-year-old woman with metastatic breast cancer comes to the physician because of a 2-day history of fever, chills, and new gluteal lesions. The lesions began as painless red…
- USMLE Step 1 · easy2. A 27-year-old man presents to the clinic with dysuria and urethral discharge for 3 days. He reports new sexual contact 10 days ago with a partner whose STI status is unknown. He…
- USMLE Step 1 · hard3. A 25 year old man presents with dysuria and urethral discharge 1 week after unprotected intercourse. Nucleic acid amplification testing for Neisseria gonorrhoeae and Chlamydia t…
- USMLE Step 1 · medium4. A 36-year-old pet shop employee presents with fever (38.9°C), dry cough, headache, and malaise after cleaning cages of sick parrots two weeks ago. Vital signs show HR 102/min, R…
- USMLE Step 1 · hard5. 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…
- USMLE Step 1 · hard6. A 61-year-old woman from Wisconsin presents 5 days after hiking in wooded terrain with fever (39.2°C), malaise, and confusion. Vital signs show HR 102/min, BP 128/82 mmHg, RR 18…
- USMLE Step 1 · medium7. A 56-year-old man from Missouri presents in July with fever (39.2°C), malaise, and frontal headache 6 days after removing a tick from his leg. Vital signs show BP 128/82 mmHg, H…
- USMLE Step 1 · hard8. A 39 year old refugee presents with high fever, severe headache, and a maculopapular rash that began on the trunk and spread outward. He has been living in crowded conditions wi…
- USMLE Step 1 · medium9. 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 wee…
- USMLE Step 1 · medium10. A 48-year-old homeless man presents with recurring fevers (38.9°C), headache, and shin pain for 2 weeks. Vital signs show BP 128/82, HR 102, RR 18, SpO2 98%. He reports poor hyg…
- USMLE Step 1 · medium11. A 12 year old girl is brought to clinic with fever and a painful lump in her right axilla. She was scratched by a new kitten 2 weeks ago. Examination shows a papule on the forea…
- USMLE Step 1 · easy12. A 33 year old woman comes to the clinic 12 hours after being bitten on the hand by her pet cat. The wound is erythematous, swollen, and very tender. She has no systemic symptoms…
- USMLE Step 1 · medium13. A 38-year-old veterinarian presents with a 3-week history of fevers (38.9°C), night sweats, weight loss, and diffuse arthralgias. He recently returned from rural Greece where he…
- USMLE Step 1 · medium14. A 42 year old hunter presents with fever, painful axillary lymphadenopathy, and an ulcerated lesion on his right hand. He says he skinned several wild rabbits 5 days ago. Gram s…
- USMLE Step 1 · easy15. A 31 year old aid worker in a refugee camp develops abrupt onset of profuse watery diarrhea and vomiting. He is dizzy, tachycardic, and has poor skin turgor, but he has no fever…
- USMLE Step 1 · medium16. A 14 year old boy is brought to the emergency department with fever, diarrhea, and right lower quadrant abdominal pain. His parents are worried about appendicitis. He recently a…
- USMLE Step 1 · hard17. A 67 year old man in the intensive care unit develops fever and worsening oxygenation 8 days after intubation. Sputum culture grows a motile gram negative rod that forms red pig…
- USMLE Step 1 · easy18. A 62 year old man with long standing alcohol use disorder is admitted with fever, productive cough, and shortness of breath. He has poor dentition and often loses consciousness…
- USMLE Step 1 · medium19. A 58-year-old woman with recurrent urinary tract infections presents with acute left flank pain and gross hematuria. Vital signs show BP 138/82, HR 94, RR 18, temperature 37.8°C…
- USMLE Step 1 · medium20. A 29 year old man presents with 1 week of progressively worsening fever, malaise, abdominal discomfort, and constipation that later became diarrhea. He recently returned from So…
- USMLE Step 1 · medium21. A 4 year old boy from a crowded daycare center is brought in with fever, abdominal pain, and frequent small volume stools mixed with blood and mucus. His mother says he had a ge…
- USMLE Step 1 · easy22. A 24 year old woman returns from a trip to Mexico with 2 days of watery diarrhea, abdominal cramping, and mild nausea. She has no fever, no blood in the stool, and no leukocytes…
- USMLE Step 1 · medium23. An 8 year old boy is brought to the emergency department for fatigue and decreased urination. Three days ago he developed severe abdominal cramps and bloody diarrhea after eatin…
- USMLE Step 1 · easy24. A 66-year-old woman hospitalized for pneumonia received clindamycin therapy. Five days into treatment, she develops watery diarrhea, lower abdominal cramping, and fever (38.5°C)…