Free Questions and Answers for All Medical Students all over the World
Infectious Diseases is tested heavily on USMLE Step 1 and Step 2 CK. This page collects every infectious diseases practice question on the site, including questions from mixed review sets.
High-yield infectious diseases topics
• Antibiotic mechanisms and toxicities
• Sepsis and septic shock management
• Tuberculosis treatment
• Bacteremia, endocarditis and pneumonia
• C. difficile and toxic shock syndrome
Try each question before opening the answer, then read the explanation even when you get it right. Each post has 3–8 exam-style questions with answers and short explanations written by Dr. Ray Makar.
Want hundreds more? See the Repeated USMLE Questions eBook series on Amazon.
A 12-year-old boy with a history of cystic fibrosis develops dyspnea, cough and fever. His temperature is 103.1 F, his pulse is 120/min and his oxygen saturation is 85%. Lung examination reveals bilateral rhonchi. What is the appropriate antibiotic treatment? A-Ampicillin B-Ampicillin and gentamicin C-Ceftazidime D-Ceftazidime and gentamicin E-Vancomycin Answer This is a case of … Read more
A 33-year-old butcher comes to the clinic because he developed eye problems. On taking history, the patient states that he eats raw hamburgers in a regular basis. The physician orders Sabin-Feldman dye test and the results come back positive. Which is the most likely cause of this patient’s condition? A- Giardiasis B- Schistosomiasis C- Trichinosis … Read more
A 31-year-old pregnant woman presents to her physician on her second trimester for a prenatal checkup. She works at a big farm. She has no concerns except for some mild swellings on her neck. On physical examination, her vital signs are within normal limits. She has mild cervical lymphadenopathy. She is prescribed an oral antibiotic … Read more
A 40-year-old man with a long history of intravenous drug addiction presents to the emergency room complaining of fever, anorexia, malaise, shortness of breath, cough and chest pain for 2 days. On physical examination, temperature is 102.7 F, Pulse is 110/min. and blood pressure is 110/66. Irregular erythematous nodules are seen on his hands and … Read more
A 22-year-old man visits the clinic for evaluation of fever, headache and dry cough for 7 days. His medical history is unremarkable and he takes no medications. He had no previous similar episodes. On examination, temperature is 101.3 F, pulse is 88/min. and blood pressure is 100/60 mmHg. On auscultation, his lungs are clear bilaterally. … Read more
A 55-year-old woman presents to the emergency room for a cut wound on her hand. While she was cutting a piece of meat, she lost control of the knife resulting in a longitudinal wound in her hand. Bleeding stopped after a few minutes. Now she is concerned about tetanus vaccination. Records show that she received … Read more