A 14-year-old boy comes in for evaluation. The patient has been experiencing severe sore throat, cervical lymphadenopathy, malaise, and low-grade fever. According to the caregiver, he was seen at an urgent care clinic one week ago, diagnosed with strep throat, and given a prescription for ampicillin. However, the caregiver is concerned because the symptoms have not improved, and he has developed a reddish-brown, macular rash. Which of the following is the best course of action?
A. This is a normal complication, and he should complete therapy as outlined.
B. Ampicillin should be immediately discontinued and changed to azithromycin.
C. Tonsillectomy should be performed several weeks after symptoms resolve.
D. Order EBV IgG and IgM