Admit:
Severe diarrhea
Outpatient antibiotic failure
Systemic response (fever, leukocytosis, severe abdominal pain)
Severe diarrhea
Outpatient antibiotic failure
Systemic response (fever, leukocytosis, severe abdominal pain)
Clostridium difficile 
Viral 
Salmonella
Bacterial
Campylobacter jejuni
Campylobacter
Yersinia enterocolitica
Shigella