A man with fever, rigors, and poor oral hygiene.

A 62-year-old man presented to the emergency department with a one-week history of subjective fever and rigors. He had had epigastric pain for three weeks, for which he was taking ranitidine, and in the past two to three months had experienced night sweats, a nonproductive cough, nausea, vomiting, and a 30-lb weight loss. He denied dsypnea, chest pain, hematochezia, melena, or any change in bowel habits.