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What is Salmonella?

By J.Gunsch
Updated Mar 03, 2024
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Salmonella refers to a genus of rod shaped bacterium, named after their discoverer Daniel Salmon in 1906. Some of these bacteria are responsible for many illnesses in humans and other animals, most commonly food poisoning and typhoid fever. Salmonella lives in the intestines of mammals, birds and reptiles and is usually harmless.

The type of salmonella that is a health hazard to humans is usually contracted by touching raw meat, raw eggs, raw shellfish or unpasteurized animal products such as milk and cheese. These bacteria can also be acquired by touching living turtles, birds and humans that have the bacteria on their hands. It is not a threat until it is ingested, which is one reason why hand washing is important.

Food poisoning caused by this bacteria results from touching or eating contaminated foods. Symptoms include diarrhea, vomiting, abdominal cramps and fever. Many foods that people prepare in their home, especially meats and poultry, have warning labels about safe handling on the packaging for this reason. Meat that is not properly cooked or food that is not temperature controlled is often the result of food poisoning when eating out.

Salmonella poisoning usually goes away on its own without treatment in five to seven days. However, if vomiting and diarrhea are severe and prolonged, a person can become dangerously dehydrated and must seek medical help. In addition, infected infants, the elderly and people that have weak immune systems often need medical care because the bacteria sometimes spreads to the bloodstream and can become fatal.

Typhoid fever is a caused by a strain of salmonella similar to that which causes food poisoning, but more severe. Unlike salmonella poisoning, typhoid fever does not resolve itself and must be treated with specific antibiotics. A person who has been treated for typhoid fever may still be contagious to others for days, weeks or years, even though that person no longer has symptoms.

Typhoid fever is not common in western countries. Rather, it is found in contaminated water and food supplies of some developing countries. Typhoid fever is mainly spread through the ingestion of feces and urine. In countries that do not have adequate sewage disposal, human and animal wastes pollute the same water that is used for drinking, cooking and hand washing. Left untreated, typhoid fever is fatal.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
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Discussion Comments

By anon81774 — On May 03, 2010

Does salmonella eat anything inside your body?

By anon78209 — On Apr 17, 2010

It doesn't live on fruit. The reason it gets on fruit is when someone that has the bacteria touches it.

By anon49414 — On Oct 20, 2009

I heard from PETA that the veggie contamination is related to poor farming and waste removal in near by animal producing farms.

By anon32937 — On May 29, 2009

Does salmonella live on any fruits or can you get it from any fruits?

By habura — On Jun 09, 2008

I always thought salmonella poisoning only had to do with meats or meat products, but apparently its been a problem on tomatoes for example since 1990 (according to the CDC). So, if it's something that lives in the intestines, how does it live on produce? Is it because of contaminated fertilizer used for the produce?

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