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USMLE-STEP-1 Online Practice Questions and Answers

Questions 1

Amedical student was bitten by infected ticks. In a week, he developed a high fever, headache, muscular aches, nausea, and splenomegaly. Five days later his symptoms subsided. However, 1 week later all his previous symptoms returned. During the next 9 days he went through a recovery and another relapse followed by a final recovery. The overall temperature curve of his illness is shown in below figure. Which of the following is the most likely etiological agent?

A. Borrelia burgdorferi

B. B. recurrentis

C. Leptospira interrogans

D. T. carateum

E. T. pertenue

Show Answer

Questions 2

A 3-year-old child arrives at the hospital in severe respiratory distress. Periorbital edema is also noted. Blood analysis reveals decreased levels of C4 and decreased levels of C1 inhibitor. This complement deficiency is likely to lead to which of the following conditions?

A. angioedema

B. an increased susceptibility to pyogenic infections

C. bacteremia

D. decreased production of anaphylatoxins

E. enhancement of antibody production

Show Answer

Questions 3

Which of the following antiviral drugs is correctly associated with the appropriate primary toxicity?

A. amantadine--neutropenia

B. didanosine--pancreatitis

C. ribavirin--hepatitis

D. ritonavir--hemolytic anemia

E. zidovudine--CNS stimulation, GI complaints

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