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?
- A)CD21GABARITO
- B)CD28
- C)CD16
- D)CD4
- E)CD19
Explicação
Epstein Barr virus infects B cells through CD21, the complement receptor also known as CR2. The clinical picture of infectious mononucleosis with posterior cervical lymphadenopathy and heterophile positive serology is classic. Ver explicação completa e trilha adaptativa →