system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 45-year-old man comes to the physician for the evaluation of painful swallowing and retrosternal pain over the past 2 days. He was recently diagnosed with HIV infection, for which he now takes tenofovir, emtricitabine, and raltegravir. There is no family history of serious illness. He has smoked one pack of cigarettes daily for the past 20 years. He drinks 2–3 beers per day. He does not use illicit drugs. Vital signs are within normal limits. Physical examination of the oral cavity shows no abnormalities. The patient's CD4+ T-lymphocyte count is 80/mm3 (normal ≥ 500). Empiric treatment is started. Two weeks later, he reports no improvement in his symptoms. Esophagogastroduodenoscopy is performed and shows multiple well-circumscribed, round, superficial ulcers in the upper esophagus. Which of the following is the most likely underlying cause of this patient's symptoms?
assistant
Infection with herpes simplex virus