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- Common pathogens: list is by no means exhaustive
- Campylobacter jejuni
- Salmonella species
- Shigella species
- Yersinia enterocolitia
- Pleisiomonas shigelloides (controversial)
- Vibrio spp.
- E. coli: multiple classified by mechanism; most important are enterotoxigenic (ETEC) and enterohemorrhagic (EHEC or E. coli 0157:H7)
- Cryptosporidia and Isospora
- Giardia lamblia
- E. histolytica
- C. difficile (increasing descriptions as community-acquired without obvious risk factors)
- Other causes of acute community-acquired diarrheal disease (not comprehensive list):
- Viruses: rotavirus, enteric adenovirus, calicivirus, astrovirus, small round virus, coronavirus.
- Parasites: Strongyloides stercoralis
- Non-infectious causes: adverse drug reactions, irritable bowel syndrome, inflammatory bowel disease (ulcerative colitis or Crohn’s disease), radiation or ischemic bowel disease, partial bowel obstruction, small bowel overgrowth, laxative abuse, collagen colitis, tube feeding and endocrine disorders among others.