What Is Salmonella?

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Salmonella is a type of bacteria that can produce a diarrheal illness called salmonellosis. Salmonella illness is typically caused by food contaminated with animal or human waste, or contact with animals that carry the bacteria. The illness usually runs its course in a few days with only supportive care needed. However, dehydration or invasive salmonella infection can be seen, especially in high-risk age groups and people with weakened immune systems.

What is Salmonella?
Verywell / JR Bee

Salmonella Symptoms 

The symptoms of salmonellosis are similar to those of a stomach virus. They include:

  • Diarrhea
  • Fever
  • Stomach cramps
  • Vomiting (occasionally)

If you become infected with salmonella, these symptoms typically appear between 6 and 48 hours after exposure to the bacteria. The symptoms usually last four to seven days and resolve on their own without treatment.

Occasionally—particularly in infants, the elderly, or those with compromised immune systems—a more serious illness may result from salmonella infection. Diarrhea may become so severe that the person needs to be hospitalized for dehydration. Invasive salmonella infection can be seen in the bloodstream and may spread to the brain, bones, or joints.

Rarely, people who have had salmonellosis can develop reactive arthritis. Symptoms of reactive arthritis include pain in the joints, painful urination, and irritation of the eyes.


Salmonella illness is caused by strains of the Salmonella bacteria that are present in animal feces and the feces of people with salmonellosis. Most people associate foodborne salmonella infection with raw or undercooked poultry or meat, but the bacteria can also be present on fruits and vegetables that are not cooked, prepared, or washed properly.

Food handlers and home cooks may spread salmonella to food if they do not properly wash their hands after using the bathroom.

Large foodborne outbreaks of salmonella infection result in contaminated food being recalled, but you may already have bought it and eaten it.  A wide variety of products can be contaminated: Past recalls include nut butter, pistachios, sprouts, coconut, organic shakes, cucumbers, chicken, shell eggs, and pork.

Salmonella may be found in the feces of many animals, including farm animals and pets. Reptiles, amphibians, and birds are the most likely pets to carry salmonella. Contact with these animals as well as their cage, tank water, and food can spread the infection.

People who are at the highest risk of salmonellosis and serious complications including babies, children age 5 and under, adults over age 65, and people with weakened immune systems.


Many people do not see their doctor for uncomplicated salmonellosis. However, people in high-risk groups or those with symptoms of dehydration or severe illness should see a doctor. You should also see your doctor if you suspect that you were infected by contaminated food so the source can be reported and investigated. Tests including a stool culture can determine if salmonella is the cause of your symptoms.

Your doctor will report the infection to your local health department and the CDC so outbreaks can be identified. In cases where it is suspected that you have a blood infection, your doctor may take a blood specimen for culture and antibiotic sensitivity testing.


Usually, no treatment is necessary for salmonella other than staying hydrated. Drinking plenty of water or an electrolyte solution (such as Pedialyte for children and infants or Gatorade for adults) is important when you have diarrhea to be sure you do not become dehydrated. Fruit juices and sodas should be avoided because they can possibly make diarrhea worse. Antibiotics are typically not necessary unless the bacteria enter the bloodstream.


Because salmonella is in the environment and potentially in our own bodies as carriers, it is important to follow some basic steps to prevent infection with the bacteria. Some things you can do include:

  • Do not eat raw or undercooked eggs, meat, or poultry. Egg yolks should be cooked until firm and meat (especially ground meats) and poultry should not be pink in the middle.
  • Do not consume raw or unpasteurized milk or dairy products.
  • Thoroughly wash all produce.
  • Keep uncooked meats separated from produce and other foods so cross contamination does not occur.
  • Thoroughly wash all cutting boards and food preparation materials after preparing uncooked foods.
  • Wash your hands before you handle food and between handling different food items.
  • Always wash your hands after using the bathroom or touching pets, especially reptiles.
  • Never keep reptiles (including turtles), amphibians, or poultry as pets in the same house with infants, young children, people over age 65, or those with compromised immune systems.
  • Wash your hands immediately after touching or holding chicks, ducklings, or other birds, and do not let children handle them at all.

A Word From Verywell

The news of a salmonella outbreak can be scary, and it is good to take warnings about product recalls seriously and discard recalled items. In addition, this is an illness that can be prevented by handwashing before eating or preparing food. Like wearing seatbelts or bike helmets, this simple practice can go a long way towards protecting you and your family.

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  1. Giannella RA. Salmonella. In: Medical Microbiology. 4th ed. Galveston, TX: The University of Texas Medical Branch at Galveston.; 1996.

  2. Tuompo R, Hannu T, Mattila L, Siitonen A, Leirisalo-repo M. Reactive arthritis following Salmonella infection: a population-based study. Scand J Rheumatol. 2013;42(3):196-202. doi:10.3109/03009742.2012.739201

  3. Fatica MK, Schneider KR. Salmonella and produce: survival in the plant environment and implications in food safety. Virulence. 2011;2(6):573-9. doi:10.4161/viru.2.6.17880

  4. Demirbilek SK. Salmonellosis in Animals. Salmonella - A Re-emerging Pathogen. 2018. doi:10.5772/intechopen.72192

  5. Eng S-K, Pusparajah P, Mutalib N-SA, Ser H-L, Chan K-G, Lee L-H. Salmonella: A review on pathogenesis, epidemiology and antibiotic resistance. Frontiers in Life Science. 2015;8(3):284-293. doi:10.1080/21553769.2015.1051243

  6. Salmonella Management and Treatment. Cleveland Clinic. Jan 17, 2019.

  7. Foods Most Likely to Cause Food Poisoning | CDC Food Safety. Centers for Disease Control and Prevention. Aug 4, 2019.

  8. Four Steps (Clean, Separate, Cook, Chill) to Food Safety | Food Safety | CDC. Centers for Disease Control and Prevention. Jul 21, 2017.

  9. Prevention | General Information | Salmonella | CDC. Centers for Disease Control and Prevention. Feb 8, 2019.

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