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Causes
By Mayo Clinic staffSalmonella bacteria live in the intestines of people, animals and birds. Most people are infected with salmonella by eating foods that have been contaminated by feces. Commonly infected foods include:
- Raw meat, poultry and seafood. Feces may get onto raw meat and poultry during the butchering process. Seafood may be contaminated if it is harvested from contaminated water.
- Raw eggs. While an egg's shell may seem to be a perfect barrier to contamination, some infected chickens produce eggs that contain salmonella before the shell is even formed. Raw eggs are used in homemade versions of mayonnaise and hollandaise sauce.
- Fruits and vegetables. Some fresh produce, particularly imported varieties, may be watered in the field or washed during processing with water contaminated with salmonella. Contamination can also occur in the kitchen, when juices from raw meat and poultry come into contact with uncooked foods, such as salads.
Many foods become contaminated when prepared by people who don't wash their hands thoroughly after using the toilet or changing a diaper. Infection also can occur if you touch something that is contaminated and then put your fingers in your mouth. This includes pets — especially birds and reptiles.
- Fact sheet: Salmonella questions and answers. Food Safety and Inspection Service, United States Department of Agriculture. http://www.fsis.usda.gov/factsheets/salmonella_questions_&_answers/index.asp. Accessed Jan. 28, 2009.
- Kaye KS, et al. Salmonella infections (including typhoid fever). In: Goldman L, et al. Cecil Medicine. 23rd ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/118188376-3/797294893/1492/1157.html#4-u1.0-B978-1-4160-2805-5..50334-7_14301. Accessed Jan. 28, 2009.
- Salmonellosis. Centers for Disease Control and Prevention. http://www.cdc.gov/nczved/dfbmd/disease_listing/salmonellosis_gi.html. Accessed Jan. 28, 2009.
- Salmonella enteritidis. Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dbmd/diseaseinfo/salment_g.htm. Accessed Jan. 28, 2009.
- Managing acute gastroenteritis among children: Oral rehydration, maintenance and nutritional therapy. Atlanta, Ga. Centers for Disease Control and Prevention. http://www.guideline.gov/summary/summary.aspx?doc_id=4362&nbr=003287&string=dehydration. Accessed Jan. 26, 2009.
