When to see a vet urgently
Seek urgent assessment if your cat develops any of the following:
- repeated vomiting or profuse diarrhoea with a clearly deteriorating general condition;
- marked tiredness, collapse or inability to remain standing;
- breathing difficulty, significant abdominal pain or severe bloody diarrhoea.
Loss of appetite and diarrhoea in a kitten or a cat that is already ill warrant a low threshold for assessment. Find a vet near you.
Overview
Salmonella bacteria are widespread in the environment and in the intestines of birds and rodents. Cats can become infected by eating raw meat or eggs, or through hunting. In most adult cats, infection is symptom-free or mild, but kittens, older cats and those in poor condition may become seriously ill.
Infection and illness from salmonellosis are different things: a cat can carry the bacteria without visible disease. Bacteria usually spread through the faecal–oral route, via contaminated food, water, hands or equipment, for example. A person may be exposed to the same contaminated food or environment as a cat, so symptoms in both do not establish which infected the other.
Bird feeding sites are a possible source of exposure. Salmonella can occur among birds at feeding sites where droppings contaminate food and soil. A sick bird is easy prey for a cat. Eating one can therefore infect a cat even if they receive only cooked food at home.
Causes
- feeding raw meat and offal, including raw or BARF diets;
- eating carcasses or spoiled food;
- hunting birds and rodents;
- contact with infected animals;
- poor hygiene in the cat's environment.
The appearance of an ingredient or a prepared frozen product does not reveal its microbiological safety. Raw food has not undergone the same bacteria-killing treatment as heated food. Thawing liquid can also spread bacteria to kitchen surfaces and utensils. Freezing or freeze-drying does not remove every pathogen.
Poor hygiene can increase spread, but infection alone does not show that the cat's environment has been inadequately cared for. Bacteria may enter the home in a contaminated product or prey animal.
Risk factors
- kittens and young cats;
- older cats and those with reduced immunity;
- cats fed raw food;
- cats in rescue centres and breeding establishments housing many animals.
Immunity, other diseases and the amount of exposure affect whether symptoms develop. An apparently healthy adult can also shed bacteria. In households with several animals, shared bowls, faecally contaminated surfaces and close contact can aid spread, so animals without symptoms are considered too.
Typical symptoms
- watery diarrhoea or diarrhoea containing mucus and pus, sometimes with blood;
- vomiting;
- fever;
- lethargy and dehydration;
- loss of appetite;
- in severe cases, sepsis and death.
Not every affected cat has every sign listed. Fever and failure to eat may be prominent, and diarrhoea may be absent. Many other diseases cause similar symptoms, so hunting a bird or having bloody stools is not enough for a Salmonella diagnosis.
At home, particularly monitor drinking, vomiting frequency, eating, stool quality and energy levels. If food or water cannot be kept down, dehydration can develop quickly. Do not decide treatment for a cat that seems feverish by using human fever or diarrhoea medicines.
Complications and consequences
- severe dehydration and electrolyte disturbances;
- sepsis and damage to internal organs;
- chronic diarrhoea and weight loss;
- bacterial shedding in faeces, allowing a symptom-free carrier to infect other animals and people.
Sepsis is a serious disturbance affecting the whole body in response to infection. It differs from infection confined to the intestine and may require hospital treatment. Rare severe cases may also involve pneumonia or pregnancy loss, for example.
Prolonged failure to eat creates an additional risk for cats. It can predispose to fatty liver disease, in which fat accumulates in liver cells and impairs liver function. Treatment planning therefore considers nutrition as well as fluids. Do not keep a cat with diarrhoea fasting for a prolonged period on your own.
Diagnosis at the vet
- faecal bacterial culture to identify Salmonella;
- PCR testing to confirm infection;
- a complete blood count to assess raised white blood cells and inflammatory changes;
- blood biochemistry to assess liver and kidney damage;
- ruling out other causes of diarrhoea, including viruses, parasites and toxins.
Tell the practice about suspected infection before arrival so your cat can be examined in a way that protects other patients. Mention raw feeding, hunting, sick or dead birds, other animals with symptoms and gastrointestinal illness in family members. The vet assesses fluid balance, circulation and general health and decides which samples are needed.
Submit a faecal sample according to laboratory instructions. Culture can identify live bacteria and, where needed, assess susceptibility to medicines. Salmonella may be shed intermittently, so one negative result does not always rule out infection. If suspicion is strong, the vet may request further samples.
PCR looks for bacterial genetic material and may also detect non-viable material. A positive result is therefore interpreted alongside symptoms and other findings. A finding in a symptom-free carrier does not automatically explain diarrhoea, which may have another cause.
Blood tests assess the inflammatory response, consequences of dehydration and organ function, among other things. White blood cell count alone does not confirm salmonellosis. A blood culture may also be considered if spread into the bloodstream is suspected. Supportive care for a seriously ill cat is not delayed while waiting for all final results.
Treatment and recovery
A mild, uncomplicated infection may resolve without antibiotics, but an ill cat's hydration and nutrition are assessed. Fluids and other symptom-relieving care are given where needed. Sepsis or severe systemic infection requires prompt antibiotics chosen by a vet and often hospitalisation.
Antibiotics are not automatically given to every cat with a positive sample. Unnecessary treatment can select resistant bacteria and does not guarantee the end of carriage. In some situations, bacterial shedding may also be prolonged. Medicine selection considers disease severity and any susceptibility result. Do not start an old course at home to prevent spread.
Follow the feeding, medicine and monitoring instructions for home care. Report promptly if appetite does not return, vomiting continues or your cat becomes more subdued. Improved symptoms do not always mean bacterial shedding has ended. Follow-up samples are considered individually; not every recovered cat needs the same testing programme.
The outlook is often good for mild disease confined to the intestine. However, severe systemic infection, dehydration and concurrent disease can change the prognosis. A positive faecal sample alone does not establish how seriously a cat will become ill; clinical condition is crucial.
Preventing spread at home with an infected cat
Wash your hands with soap after handling faeces, vomit, litter trays and feeding equipment, and before preparing human food. Keep cleaning tools for cat bowls separate from those for human dishes. Do not allow a sick cat onto dining tables or food preparation surfaces.
Place the litter tray where young children cannot reach it. Extra care is needed in homes with young children, older people, pregnant people or those with weakened immunity. A sick cat should not sleep in a young child's bed or lick faces. If a person develops gastrointestinal illness, tell their healthcare provider about possible Salmonella exposure.
Keep a recovering cat supervised so you can monitor eating and stools and prevent renewed exposure to prey. In a multi-cat home, ask for guidance on managing contact, bowls and spaces too. Hygiene applies to the whole household even if other cats show no signs.
Prevention
- Avoid feeding uncooked food, or maintain careful hygiene when raw feeding.
- Control exposure to rodents and birds in the cat's environment.
- Maintain hygiene in rescue centres and breeding establishments.
- Wash your hands after handling your cat and the litter tray to help protect people.
Careful raw-food hygiene reduces bacterial spread but does not make untreated meat as low-risk as adequately heated food. Keep pet food separate from human food, thaw frozen food in a closed container in the fridge and clean surfaces it touches. Wash food and water bowls too.
At bird feeding sites, reduce the accumulation of droppings and food waste and keep cats away from sick birds. Wash your hands after cleaning feeders too. This addresses both hunting-related exposure and spread through people's hands.
Important for cat owners
Salmonellosis is an uncommon but dangerous infection in cats that also poses a risk to people. Remember that prolonged diarrhoea and lethargy always warrant a veterinary visit. Even a symptom-free carrier can infect people, so prevention through appropriate feeding and hygiene is essential.
This article provides general information and does not replace veterinary care. If you notice signs of illness in your cat, contact a vet.
Frequently asked questions
Can a cat without symptoms spread Salmonella?
Yes. Bacteria may be shed in faeces even when a cat seems healthy or has recovered. Hand, bowl and litter tray hygiene therefore continues after symptoms resolve.
Does a Salmonella-positive cat always need antibiotics?
No. The need depends particularly on general condition and suspicion of systemic infection. Antibiotics are not used simply to eliminate carriage or protect others; the vet assesses benefits and drawbacks.
Can infection occur without raw feeding?
Yes. Cats can be exposed through prey or a faecally contaminated environment. Eating a sick small bird is a possible route even for a cat fed cooked food.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
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