What is salmonellosis?
Salmonellosis is a type of foodborne illness caused by the Salmonella enterica bacterium. There are many different kinds of these bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common types in Canada and the United States.
Salmonellosis is more common in the summer than in the winter. Children are the most likely to get salmonellosis. Young children, older adults, and people who have impaired immune systems are the most likely to have severe infections.
What causes it?
You can get salmonellosis by eating food contaminated with salmonella. This can happen in the following ways:
- Food may be contaminated during food processing or food handling.
- Food may become contaminated by the unwashed hands of an infected food handler. A frequent cause is a food handler who does not wash their hands with soap after using the toilet.
- Salmonella may also be found in the feces of some pets, especially those with diarrhea. You can become infected if you do not wash your hands after contact with these feces.
- Reptiles, baby chicks and ducklings, and small rodents such as hamsters are particularly likely to carry Salmonella. You should always wash your hands immediately after handling one of these animals, even if the animal is healthy. Adults should also be careful that children wash their hands after handling reptiles, pet turtles, baby chicks or ducklings, or small rodents.
Beef, poultry, milk, and eggs are most often infected with salmonella. But vegetables may also be contaminated. Contaminated foods usually look and smell normal.
What are the symptoms?
Symptoms of salmonellosis include diarrhea, fever, and abdominal cramps. They develop 6 hours to 6 days after infection, and the illness usually lasts 4 to 7 days. Most people recover without treatment. But diarrhea and dehydration may be so severe that it is necessary to go to the hospital. Older adults, infants, and those who have impaired immune systems are at highest risk.
If you only have diarrhea, you usually recover completely, although it may be several months before your bowel habits are entirely normal. A small number of people who are infected with salmonellosis develop reactive arthritis, a disease that can last for months or years and can lead to chronic arthritis.
How is it diagnosed?
Salmonellosis is diagnosed based on a medical history and a physical examination. Your doctor will ask you questions about your symptoms, foods you have recently eaten, and your work and home environments. A stool culture and blood tests may be done to confirm the diagnosis.
How is salmonellosis treated?
You treat salmonellosis by managing any complications until it passes. Dehydration caused by diarrhea is the most common complication. Antibiotics are not usually needed unless the infection has spread.
To prevent dehydration, drink plenty of fluids. Choose water and other clear liquids until you feel better. You can take frequent sips of a rehydration drink (such as Pedialyte). Soda, fruit juices, and sports drinks have too much sugar and not enough of the important electrolytes that are lost during diarrhea. These kinds of drinks should not be used to rehydrate.
When you feel like eating again, start with small amounts of food. This will help you to get enough nutrition.
How can you prevent it?
To prevent salmonellosis:
- Do not eat raw or undercooked eggs. Raw eggs may be used in some foods such as homemade hollandaise sauce, Caesar and other salad dressings, tiramisu, homemade ice cream, homemade mayonnaise, cookie dough, and frostings.
- Cook foods until they are well done. Use a meat thermometer to be sure foods are cooked to a safe temperature. Do not use the colour of the meat (such as when it is no longer "pink") to tell you that it is done.
- Avoid raw or unpasteurized milk or other dairy products.
- Wash or peel produce before eating it.
- Avoid cross-contamination of food. Keep uncooked meats separate from produce, cooked foods, and ready-to-eat foods. Thoroughly wash hands, cutting boards, counters, knives, and other utensils after handling uncooked foods.
- Wash your hands before handling any food and between handling different food items.
- Do not prepare food or pour water for others when you have salmonellosis.
- Wash your hands after contact with animal feces. Since reptiles are particularly likely to carry salmonella bacteria, wash your hands immediately after handling them. Consider not having reptiles (including turtles) as pets, especially if you have small children or an infant.
Current as of: October 31, 2022
Author: Healthwise Staff
E. Gregory Thompson MD - Internal Medicine
Adam Husney MD - Family Medicine
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