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A 35-year-old woman comes to the emergency department with 3 days of burning substernal chest pain and "excruciating" pain with swallowing. She could not eat or drink anything today due to severe pain. She has not had nausea, vomiting, difficulty initiating swallowing, or a sensation of food getting stuck in her throat. The patient has a history of HIV, asthma, and uterine fibroids. Her current medications include atazanavir-ritonavir, tenofovir, emtricitabine, trimethoprim-sulfamethoxazole, azithromycin, and albuterol. She has a history of medication noncompliance but says that she is currently taking all her medications as prescribed. Her most recent CD4 count was 30/mm3. Her temperature is 37.9 C (100.2 F) , blood pressure is 108/59 mm Hg, and pulse is 103/min. The patient is thin and somewhat pale. She has significant dental caries, but oral examination is otherwise normal. Cardiopulmonary examination is unremarkable. The abdomen is soft and nontender. Empiric therapy is initiated, and upper gastrointestinal endoscopy is scheduled. Which of the following is the most likely cause of this patient's symptoms?
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