| Bug | Transmission | Comments |
| Staphylococcus aureus | Custards, mayonnaise/potato salad, canned meats | Symptoms start and end quickly |
| Bacillus cereus | Reheated rice, food kept warm but not hot | Symptoms start and end quickly |
| Clostridium botulinum | Canned food, home-canned alkaline vegetables | — |
| Clostridum perfringens | Reheated meat | Watery diarrhea |
| Clostridium difficile | Endogenous, nosocomial
NOTE: not food poisoning | Watery diarrhea |
| E. coli (EHEC – no invasion, no WBCs; EIEC – invasion + WBCs) | Undercooked meat, contaminated food, fecal-oral | Bloody diarrhea |
| E. coli (ETEC) | Undercooked meat, contaminated food, fecal-oral | Watery diarrhea |
| Legionella pneumophila | contaminated water (especially in smokers) | Pneumonia, fever, diarrhea, hyponatremia |
| Salmonella enteridis | Chicken products (eggs, raw chicken) | Diarrhea may be bloody |
| Shigella dysenteriae | Fecal-oral | Bloody diarrhea |
| Campylobacter jejuni | Poultry, unpasteurized milk, fecal-oral | Bloody diarrhea with pus |
| Vibrio cholerae | Fecal-oral | Watery diarrhea (“rice water stools”) |
| Vibrio parahaemolyticus/vulnificus | Seafood, sushi (leading cause of diarrhea in Japan) | — |
| Yersinia enterocolitica | Contaminated milk, pork, pet feces | Bloody diarrhea |
| Brucella | Unpasteurized dairy products | — |
| Adenovirus | Fecal-oral | Watery diarrhea
Pediatric |
| Norwalk virus | Fecal-oral | Watery diarrhea
Pediatric |
| Reovirus | Fecal-oral | — |
| Rotavirus | Fecal-oral | Watery diarrhea
Infant mortality |
| Giardia lamblia | Fecal-oral | Watery diarrhea
Associated with campers/hikers |
| Entamoeba histolytica | Fecal-oral | Bloody or watery diarrhea |
| Cryptosporidium | Fecal-oral | Watery diarrhea
Diarrhea in AIDS |
| Taenia solium | Pork | Intestinal tapeworm, neurocysticercosis |
| Taenia saginata | Beef | Intestinal tapeworm |
| Diphyllobothrium latum | Fish | Intestinal tapeworm |
