A 21-year-old woman comes to the university health clinic ...

He denies fevers and reports only 1 episode of small volume, non-bloody diarrhea. He lacks significant abdominal pain. The symptoms reportedly began 6 hours after eating a hamburger and macaroni salad at a neighborhood fast food restaurant. His temperature is 37 C (98.6 F), blood pressure is 105/70 mm Hg, pulse is 100/min, and his respirations ... ................
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