Viral Infections USMLE Step 1 Practice Question
A 17-year-old boy presents with fever (39.2°C), severe sore throat, malaise, and posterior cervical lymphadenopathy for 5 days. Vital signs: HR 98/min, BP 118/76 mmHg, RR 16/min, SpO2 98% on room air. Examination reveals tonsillar exudates and splenomegaly. Monospot test is positive; CBC shows lymphocytosis with atypical lymphocytes. He denies recent cough or rhinorrhea. Which virus most likely causes this patient's illness?
Answer choices
- AParvovirus B19
- BEpstein Barr virusCorrect answer
- CHuman herpesvirus 6
- DAdenovirus
- ECytomegalovirus
- FHuman immunodeficiency virus
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