A 22-year-old male presents to his family physician complain…
A 22-year-old male presents to his family physician complaining of fatigue, muscle pain, periorbital edema, and fever. He denies travel outside the US. The physician suspects infectious mononucleosis (IM); however, the serologic tests for IM are negative. The complete blood count revealed a slightly elevated white blood cell count, and there was an increase of eosinophils on the differential. Which of the following should be considered as a possible cause for the patient’s symptoms?