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 · medium49. A 24-year-old female presents with fever (38.9°C), malaise, and a dry, nonproductive cough for 5 days. She reports headache, myalgias, and leg pain. Vital signs show HR 102/min,…
- USMLE Step 1 · medium50. A 3-year-old male presents with a 1-day history of loose stools, fever, abdominal cramping, headache, and myalgia. Vital signs show temperature 38.9°C, heart rate 112/min, blood…
- USMLE Step 1 · medium51. A 16-year-old male with sickle cell disease is hospitalized for a severe infection. His spleen has autosplenectomized, and he has had other minor infections in the past. His sym…
- USMLE Step 1 · medium52. A 23-year-old female with sickle cell disease presents with fever (39.2°C), severe left tibial pain, and tachycardia (HR 108/min). Blood pressure is 118/76 mmHg, respirations 18…
- USMLE Step 1 · medium53. A culture of smooth Streptococcus agalactiae bacteria is grown in nutrient broth and allowed to incubate until the culture enters the decline phase of the growth curve. An extra…
- USMLE Step 1 · medium54. A baby born at 32 weeks' gestation with Apgar scores of 2 and 7 was placed in the neonatal intensive care unit. She developed a fever and leukocytosis; lumbar puncture revealed…
- USMLE Step 1 · medium55. A 7-year-old male presents to the pediatrician because his mother noticed a 'smoky' color to his urine. On questioning the mother, it is revealed that the child had a sore throa…
- USMLE Step 1 · medium56. A 69-year-old, alcohol-dependent male comes to the emergency department because of high fever, chills, and a cough. He says that he has been producing 'lots of thick, bloody, ge…
- USMLE Step 1 · medium57. A 58-year-old male with alcohol use disorder and multiple dental caries develops a pulmonary abscess (chest X-ray shows cavitary lesion with air-fluid level). He is started on c…
- USMLE Step 1 · medium58. A 47-year-old male with a history of sickle cell disease has had numerous hospitalizations requiring the placement of IV lines. The patient has poor peripheral venous access, an…
- USMLE Step 1 · medium59. A 35-year-old male presents to the emergency department with intense back pain. He is hydrated and given pain medication. After several hours, he passes a kidney stone. Laborato…
- USMLE Step 1 · medium60. A 60-year-old female comes to the physician because of fever, chills, and a cough for the past 2 weeks. She lives at home with her husband, has no chronic medical conditions, an…
- USMLE Step 1 · medium61. A 20-year-old female presents with a 2-day history of dysuria and increased urinary frequency. She states that she was recently married and was not sexually active prior to the…
- USMLE Step 1 · medium62. A 58-year-old female is admitted to the hospital with fever, abdominal cramps, and severe watery diarrhea. The symptoms began one day after attending a banquet. She was treated…