A 21-year-old African-American food handler from Memphis, who works in a nursing home facility, has experienced increasingly severe nausea and vomiting over the past six days. During the last day he has complained of chest pain, slight nonproductive cough, and a fever. He denies a previous history of allergy, surgery, or hospitalization. He smoked for two years but quit several years ago. He denies TB exposure, hemoptysis, headache, night sweats, and weight loss. He denies cave exploration
and exotic pets.