Review Question - QID 214973

A 41-year-old man presents to his primary care physician with a 2-week history of low-grade fever and cough. He says that he recently went camping with his family in western Tennessee and started experiencing symptoms about 1 week after returning home. He has also experienced intermittent nausea, abdominal pain, and diarrhea during this time. His past medical history is significant for hypertension, but he is not currently taking any medications. Physical exam reveals numerous oral ulcers on the tongue and soft palate. Which of the following would most likely be seen on tissue biopsy in this patient?