Virology USMLE Step 1 Practice Question
A 15-year-old boy presents with fever (39.2°C), severe pharyngitis, and posterior cervical lymphadenopathy. Vital signs show HR 102/min, BP 118/76 mmHg, RR 18/min, and SpO2 98% on room air. Monospot test is positive with elevated atypical lymphocytes on CBC. He denies rash and abdominal pain. He is not on antibiotics. Which cell surface molecule does the causative virus use to gain entry into B lymphocytes?
Answer choices
- ACD21Correct answer
- BCD28
- CCD16
- DCD4
- ECD19
- FCD35
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