case1 A 52-year-old black woman with rheumatoid arthritis for 24 years was admitted to the hospital with complaints of fever and diarrhea for the preceding 24 hours One month earlier she had been hospitalized for neck surgery and received a 10-day course of a broad-spectrum antibiotic(ceftazidime) Medications: asparin and large quantities of antacids Epidemioly: Her son had brought her an egg salad sandwich from Famous Deli, which they shared 16 hours before onset of the illness Her son also has severe diarrheacase1 • A 52-year-old black woman with rheumatoid arthritis for 24 years was admitted to the hospital with complaints of fever and diarrhea for the preceding 24 hours. • One month earlier she had been hospitalized for neck surgery and received a 10-day course of a broad-spectrum antibiotic (ceftazidime). • Medications: asparin and large quantities of antacids. • Epidemioly: Her son had brought her an egg salad sandwich from Famous Deli, which they shared 16 hours before onset of the illness. Her son also has severe diarrhea. 15