Bacteriology USMLE Step 1 Practice Questions
62 board-style USMLE Step 1 questions in Microbiology/Immunology. Each question shows the correct answer; create a free account for the full explanation and adaptive practice.
- USMLE Step 1 · hard1. A 44-year-old woman with type 2 diabetes mellitus comes to the physician with a 3-day history of fever, right calf pain, and swelling. Her temperature is 38.7°C (101.7°F). Physi…
- USMLE Step 1 · medium2. A previously healthy 13-year-old girl is brought to the physician by her parents because of a 2-day history of low-grade fever, headache, nausea, and a sore throat. Examination…
- USMLE Step 1 · medium3. A 35-year-old man comes to the physician with a 2-month history of fever, night sweats, and a cough productive of white sputum. He lives in New York and is currently homeless. H…
- USMLE Step 1 · easy4. A 1-day-old male infant born at 26 weeks' gestation via spontaneous vaginal delivery presents with progressive respiratory distress. Vital signs show respiratory rate 52/min, he…
- USMLE Step 1 · medium5. A 15-year-old girl presents to your clinic with primary amenorrhea. She reports normal pubertal development with breast development beginning at age 12 and pubic hair developmen…
- USMLE Step 1 · medium6. A 64-year-old woman with poorly controlled type 2 diabetes mellitus presents to the emergency department with a 1-week history of progressive erythema, warmth, and swelling of h…
- USMLE Step 1 · medium · image7. A 43-year-old man with a 20-year history of alcohol use disorder presents to the hospital with acute pancreatitis complicated by sepsis. On hospital day 3, he develops a high fe…
- USMLE Step 1 · medium8. A 45-year-old man with a 20 pack-year smoking history and COPD presents to the emergency department with a 3-day history of productive cough with purulent sputum, dyspnea, and f…
- USMLE Step 1 · easy9. A 32-year-old woman presents with a 2-day history of dysuria, urinary frequency, and suprapubic pain. She has no fever, flank pain, or systemic symptoms. Urinalysis shows pyuria…
- USMLE Step 1 · hard10. A 41-year-old woman with a 10-pack-year smoking history presents with an 8-week progressive cough productive of scant sputum, night sweats, and unintentional weight loss of 12 p…
- USMLE Step 1 · medium11. A 67-year-old man with a prosthetic heart valve presents with fever (38.9°C), new systolic murmur, and malaise 6 months post-replacement. Vital signs show HR 102/min, BP 118/76…
- USMLE Step 1 · medium12. A 28-year-old G2P1 woman at 20 weeks gestation presents to the emergency department with a 2-day history of fever (38.5°C), myalgias, and mild nausea. She reports recent consump…
- USMLE Step 1 · medium13. A 45-year-old man with COPD presents to the emergency department with a 3-day history of productive cough with green sputum, dyspnea, and fever. Vital signs: BP 128/82 mmHg, HR…
- USMLE Step 1 · medium14. A 32-year-old woman presents to the emergency department with a 3-day history of fever, severe frontal headache, and neck stiffness. She reports photophobia and has had one epis…
- USMLE Step 1 · medium15. A 42-year-old woman with a 10-year history of systemic lupus erythematosus presents to the emergency department with a 3-day history of dysuria, frequency, and left flank pain.…
- USMLE Step 1 · hard16. A 55-year-old man with rheumatoid arthritis managed with infliximab presents to clinic with a 3-week history of a painless, indurated ulcer with minimal drainage on his left for…
- USMLE Step 1 · medium17. A 28-year-old man presents to the emergency department 6 hours after eating raw oysters at a seafood restaurant. He reports acute onset of profuse, watery diarrhea and severe cr…
- USMLE Step 1 · medium18. A 3-year-old boy with no prior vaccinations presents to the emergency department with a 4-day history of sore throat, low-grade fever (38.5°C), and progressive barking cough wit…
- USMLE Step 1 · medium19. A 34-year-old woman with a history of recent abortion presents with fever, chills, and abdominal pain. Blood cultures grow a gram-negative coccobacillus that requires special me…
- USMLE Step 1 · medium20. A 67-year-old man with a 10-day history of productive cough, fever, and dyspnea is admitted to the hospital. He has a history of COPD but denies recent aspiration, dental proced…
- USMLE Step 1 · medium21. A 28-year-old woman with no significant past medical history presents to the emergency department with a 3-day history of high fever, productive cough with purulent sputum, and…
- USMLE Step 1 · medium22. A 45-year-old man with COPD presents with sudden-onset fever (39.2°C), productive cough with blood-tinged sputum, and pleuritic chest pain. Vital signs show HR 108/min, RR 22/mi…
- USMLE Step 1 · medium23. A 32-year-old woman presents to the emergency department with a 2-day history of fever, severe headache, and neck stiffness. She also reports photophobia and mild confusion. Tem…
- USMLE Step 1 · medium24. A 19-year-old college freshman living in dormitory housing presents with fever (39.2°C), severe headache, neck stiffness, and petechial rash. Vital signs show HR 118/min, RR 22/…