Acute Diarrhea - Differential Diagnostic Algorithm

Watery/Large Volume (Small Bowel)

 • Viral

 • Bacterial (e.g. C peffrjngens, V. cholerae, E. coli, Salmonella, Yersinia)

 • Parasitic (e.g. Giardia)

 • Drugs (Antibiotics, Laxatives, Antacids)

 • Toxins

Bloody/Pain/Small Volume/Urgency (Large Bowel)

 • Bacterial (e.g. E. coli, C difficile, Salmonella, Campylobacter, Shigella)

 • Parasitic (e.g. E. histolytjca)

Nausea/Vomiting Predominant

 • Bacillus cereus

 • Staphylococcus aureus

 • Crohn's Ileitis

 • Crohn's Colitis

Bloody

 • Ulcerative Colitis

 • Crohn's Colitis



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