Review Question - QID 214348

A 18-year-old male college student presents to the student health center with a week long history of mild fevers and malaise. He reports symptoms of chills, arthralgias, a hoarse cough, and pain with swallowing. The patient has a recent history of travel to Cabo San Lucas, Mexico 3 weeks prior to presentation, where he had 1 episode of gastroenteritis with nausea and vomiting that resolved after 24 hours. His temperature is 101.9°F (39°C), pulse is 110/min, respirations are 18/min, and blood pressure is 125/73 mmHg. On physical examination, the patient has a mild maculopapular rash on his chest and neck. Laboratory tests reveal lymphocytosis, the peripheral blood smear finding seen in Figure A, and negative heterophile antibodies. Which of the following is the most likely causative pathogen of this patient’s symptoms?