Review Question - QID 108888

A 16-year-old male presents to his pediatrician with a sore throat. He reports a severely painful throat preceded by several days of malaise and fatigue. He has a history of seasonal allergies and asthma. The patient is a high school student and is on the school wrestling team. He takes cetirizine and albuterol. His temperature is 100.9°F (38.3°C), blood pressure is 100/70 mmHg, pulse is 100/min, and respirations are 20/min. Physical examination reveals splenomegaly and posterior cervical lymphadenopathy. Laboratory analysis reveals the following:

Serum:
Na+: 145 mEq/L
K+: 4.0 mEq/L
Cl-: 100 mEq/L
HCO3-: 24 mEq/L
BUN: 12 mg/dL
Ca2+: 10.2 mg/dL
Mg2+: 2.0 mEq/L
Creatinine: 1.0 mg/dL
Glucose: 77 mg/dL

Hemoglobin: 17 g/dL
Hematocrit: 47%
Mean corpuscular volume: 90 µm3
Reticulocyte count: 1.0%
Platelet count: 250,000/mm3
Leukocyte count: 13,000/mm3
Neutrophil: 45%
Lymphocyte: 42%
Monocyte: 12%
Eosinophil: 1%
Basophil: 0%

Which of the following cell surface markers is bound by the pathogen responsible for this patient’s condition?