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A 52 year old male  patient with AIDS with a CD 4 count of 69 from the Mississippi River valleys. Presents with fever, worsening cough, weight loss, malaise, and dyspnea. The patient also had symptoms of diarrhea and abdominal pain. 

You note oropharyngeal ulcers involving the patient's buccal mucosa, toung, gingiva and larynx.

Which of the following is the most likely diagnosis?