December 11, 2009
The American Veterinary Medical Association (AVMA) and the Association of Reptile and Amphibian Veterinarians (ARAV) provide the following information for pet owners concerned about Salmonella associated with amphibians and reptiles.
Q: What is Salmonella?
A: Salmonella is actually the name for an entire family of bacteria, not just one type. Members of the Salmonella family usually live in the intestines of humans or animals, and the bacteria may be passed (shed) in the stool. Not all Salmonella infections cause illness.
Q: What is salmonellosis?
A: Salmonellosis is the disease that results from Salmonella infection. People with salmonellosis usually have diarrhea, stomach pain/cramps and a fever. They are usually ill for 4-7 days. Most people with salmonellosis recover from their illness without treatment, but some become very ill and need to be hospitalized and intensively treated. If the bacteria are absorbed into the blood from the intestine, they can infect other organs and the infection can become severe enough to cause death.
Q: What is the difference between being infected and being a carrier of Salmonella?
A: When someone is infected, they usually develop illness (salmonellosis). A carrier is a person or animal who has the Salmonella bacteria living in their intestinal tract (gut), but doesn't get ill. Carriers may pass the bacteria in their stool (this is called "shedding" the bacteria), and it is possible for a carrier to infect other animals or people that come into contact with the carrier's stool while they are shedding the bacteria.
Q: What types of animals can be infected with or carry Salmonella?
A: Many animals can be infected with and/or become carriers of Salmonella, including birds, livestock, horses, reptiles, amphibians, rodents, dogs and cats. And yes, even people can be Salmonella carriers. Carriers are more likely to shed the bacteria in their feces (stool) when they are stressed or when their immune systems are weakened by medications or disease.
Q: How do amphibians and reptiles spread Salmonella to people?
A: Amphibians and reptiles can harbor Salmonella bacteria in their intestinal tract (gut), and can pass (shed) the bacteria in their feces (stool) off and on or continuously. People become infected when they swallow the bacteria. Because bacteria are invisible to the naked eye, you can't see them on surfaces, your hands, etc. If you come into contact with a contaminated surface or piece of equipment (such as cage equipment, food bowls, etc.), or the stool of an animal shedding the bacteria, you can get the bacteria on your skin. If you then eat, prepare food, or touch your face or mouth without properly washing your hands first, you may end up swallowing the bacteria and infecting yourself with Salmonella.
Q: Are certain people at higher risk of being infected with Salmonella and becoming ill?
A: Yes. Elderly people and infants are at higher risk. People with weakened immune systems, due to disease or medications, are more likely to be infected and more likely to develop severe illness.
Q: Are there other ways people can become infected by Salmonella?
A: Definitely. It is a foodborne disease – most commonly, people become infected with Salmonella when they eat food that has been contaminated with the feces (stool) from an infected animal. Improperly prepared or undercooked/raw animal products, such as beef, poultry, milk (unpasteurized) and eggs, are the most common sources of foodborne salmonellosis, but even vegetables or fruit can become contaminated with feces and infect people if eaten without first being properly prepared.
Q: Are there certain species of reptiles and amphibians that are more likely to carry Salmonella?
A: One group of animals that is considered likely to spread Salmonella is turtles with shells less than 4 inches (10.2 cm) in length. This isn't because they're any more likely to be carriers, it's because their small size makes them more likely for toddlers and infants to put them in their mouths. Since 1975, it has been illegal to sell or distribute turtles with shell lengths less than 4 inches (10.2 cm).
Any amphibian or reptile has the potential to carry and shed Salmonella. For safety's sake, it is recommended that you treat all amphibians and reptiles as if they are carriers of Salmonella.
Q: Will Salmonella make my pet amphibian/reptile sick?
A: The bacteria do not usually cause illness in amphibians and reptiles.
Q: How can I find out if my pet amphibian/reptile is carrying Salmonella?
A: You won't know just from looking at it whether or not an amphibian or reptile is carrying Salmonella. Fecal (stool) or cloacal cultures will determine if your pet is carrying the bacteria. Since they have to be shedding the bacteria in their feces (stool) and some only shed the bacteria intermittently, several cultures may be necessary to detect Salmonella.
Q: My pet amphibian/reptile is a Salmonella carrier. Can it be treated so it no longer carries the bacteria?
A: Unfortunately, no. Once your pet becomes a carrier, it will most likely remain a carrier. But the good news is that simple measures, such as proper hygiene and sanitation, can dramatically reduce the chances that you or others could become infected by your pet. In addition, keeping your pet healthy and free of stress can reduce the chances it will shed the bacteria.
Q: We are expecting a child and we're worried about Salmonella. Should we get rid of our pet amphibian or reptile?
A: Absolutely not! As we've already said, there are many simple, common sense things you can do to protect your family.
Q: What can I do to protect my family from amphibian- or reptile-associated Salmonella?
A: There are many simple, common sense things you can do to protect your family.
Do not bathe reptiles or amphibians in your kitchen sink or near any areas used for food or drink preparation. If you use a bathtub for this purpose, it should be thoroughly cleaned and bleached afterward to kill any bacteria that may remain on the surface.
Q: How can I thoroughly clean and disinfect my pet reptile's/amphibian's habitat?
A: Your veterinarian is the best source of information about your pet amphibian's or reptile's care, but here are some basic guidelines for thoroughly cleaning and disinfecting the habitat.
Q: How often should I clean my pet reptile's/amphibian's habitat?
A: It varies, depending on your pet's species, hygiene habits, the size of the habitat, and how many pets you have in the habitat. Daily cleaning to remove feces (stool), uneaten food, and other items can help keep the habitat cleaner and reduce the effort required to keep it clean. In addition, it allows you to detect any changes in your pet's feces, behavior or appetite. In general, habitats should be thoroughly cleaned and disinfected weekly. Consult with your veterinarian about the best cleaning schedule for your pet.
For more information about reptiles, amphibians and Salmonella:
AVMA resourcesPodcast: Kiss a Frog? Veterinarians warn against it
Brochure: Selecting an Amphibian
Brochure: Selecting a Pet Reptile
Association of Reptile and Amphibian Veterinarians:Find an Amphibian and Reptile Veterinarian
* Salmonella Information for Veterinarians PDF)
* Salmonella Information for Reptile and Amphibian Owners PDF)
*Note: although these materials specifically address reptiles, the information and recommendations also apply to amphibians.
National Association of State Public Health VeterinariansCompendium of Measures to Prevent Disease Associated with Animals in Public Settings, 2009
U.S. Centers for Disease Control (CDC)CDC Kidtastics podcast: "Water Frogs, Aquariums, and Salmonella -- Oh My!"
Investigation announcement: outbreak of human Salmonella typhimurium infections associated with contact with water frogs (December 7, 2009)
Reptiles and Salmonella
General Salmonella information
Salmonella: Frequently Asked Questions
U.S. Food and Drug Administration FDA reminds public that frogs carry Salmonella (December 8, 2009)
Brochure: Pet Turtles: A common source of Salmonella View brochure (pdf) Order copies of the brochure