Bacterial Enteritis in Cats (Campylobacter, Salmonella)
Bacterial enteritis is inflammation of the intestines caused by bacteria, mainly Campylobacter and Salmonella. It results in sudden-onset diarrhea, sometimes with blood, mucus, fever, and vomiting. It is more severe in kittens. Many cats ca...
What is it?
Bacterial enteritis is inflammation of the intestines caused by bacteria, mainly Campylobacter and Salmonella. It results in sudden-onset diarrhea, sometimes with blood, mucus, fever, and vomiting. It is more severe in kittens. Many cats carry these bacteria without becoming ill: they are called healthy carriers. The disease develops mainly in young animals, stressed animals, or those with weakened immune systems. These bacteria can be transmitted to humans: basic hygiene practices are sufficient to limit this risk.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Diarrhea that starts suddenly in a cat that was well just a few days before. Liquid or mucous stools, sometimes containing blood. Fever: this is a sign that helps distinguish it from diarrhea caused by food or parasites. Vomiting, loss of appetite. Lethargy, cat hiding. Tenderness in the abdomen when touched. Dehydration, which develops rapidly in kittens. The episode usually lasts from a few days to two weeks; with Campylobacter, diarrhea may return for several weeks.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The bacteria Campylobacter and Salmonella, present in the digestive tract of many animals. The disease develops when the cat ingests a large amount of bacteria, or when its immune defenses are weakened. Raw or undercooked meat or poultry and raw milk are common sources.
Diet based on raw or undercooked meat, poultry, or milk.
Recent adoption from a shelter or rescue organization.
Kitten under six months old or senior cat.
Recent hospitalization or other illness that weakens the immune system.
Transmission
By mouth: contaminated raw food, contaminated water or food bowls, contact with feces from an infected or carrier animal. Hunting birds or rodents can also expose the cat to infection. Shelters and shared living spaces promote the spread of bacteria between animals. An infected or carrier cat, whether showing signs or not, sheds bacteria in its feces and can contaminate other animals and humans.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian will examine the cat, take its temperature, and assess dehydration.
They will ask about the cat's diet, where it came from, and whether anyone in the household also has diarrhea.
A stool sample can be tested for bacteria by culture or DNA detection. Since many healthy cats carry these bacteria, a positive result must always be interpreted together with the clinical signs.
A blood test is helpful if the cat is very lethargic or fevered.
Other causes of acute diarrhea are ruled out: panleukopenia in unvaccinated kittens, parasites, or dietary upset.
Treatment
Most cats recover with supportive care: rehydration, easily digestible food, and medication for vomiting if needed.
Antibiotics are not given routinely. They are reserved for severely affected cats, kittens, weakened animals, or when the infection appears to be spreading, as determined by the veterinarian. Misuse of antibiotics can prolong the carrier state of certain bacteria.
Severely lethargic or dehydrated cats are hospitalized and given IV fluids.
No over-the-counter human anti-diarrheal medication should be given without veterinary advice.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Do not feed raw or undercooked meat, poultry, or milk.
Clean litter boxes and food bowls daily.
Limit hunting when possible.
Observe a recently adopted cat before allowing close contact with other animals.
Wash your hands after handling litter or raw meat.
Possible complications
Severe dehydration, especially in kittens.
Bacteremia in a weakened animal—a serious condition requiring hospitalization.
Prolonged carrier state, posing a risk to other animals and household members.
Recurrent diarrhea, particularly with Campylobacter.
When to see a veterinarian
Your cat has bloody diarrhea, fever, and is lethargic: seek care the same day.
Your kitten is very lethargic or stops drinking: seek emergency care.
It vomits repeatedly or stops eating.
A vulnerable person lives in the household—an infant, elderly person, or immunocompromised individual: practice strict hand and litter hygiene and discuss this with your veterinarian.
In a male cat, straining in the litter box with nothing produced may indicate urinary obstruction: seek emergency care.
Transmission to humans
Campylobacter and Salmonella can spread from cats to humans, most often through the hands after contact with feces or a soiled litter box. In humans, they mainly cause diarrhea.
The risk can be managed with simple steps: wash your hands with soap after changing the litter box or handling a sick cat, and before eating; do not change the litter box in the kitchen; clean the box regularly.
Young children should be kept away from the litter box and should wash their hands after playing with the cat.
Pregnant women, elderly people, and immunocompromised individuals should consider having someone else clean the litter box, or wear gloves.
If someone in the household develops diarrhea at the same time as the cat, inform your doctor and your veterinarian.
Prognosis
In most adult cats, bacterial enteritis heals within a few days with supportive care.
The prognosis is more guarded in kittens, elderly or weakened cats, and when bacteria enter the bloodstream.
Some cats remain carriers after recovery, showing no signs of illness.
Frequently asked questions
How to distinguish bacterial enteritis from simple food-related diarrhea? **Bacterial enteritis** is characterized by: - Sudden onset with severe abdominal cramps and pain - Bloody or mucous stools - High fever (often above 38.5°C/101°F) - Systemic symptoms (chills, malaise, headache) - Symptoms lasting more than 3-4 days - Possible dehydration signs **Simple food-related diarrhea** typically shows: - Mild to moderate symptoms - Watery stools without blood or mucus - Little or no fever - Abdominal discomfort rather than severe pain - Symptoms usually resolve within 24-48 hours - Normal general condition **Key distinguishing factors:** - Fever intensity and presence - Blood or mucus in stools - Severity of abdominal pain - Duration of symptoms - Overall general condition **When to seek medical care:** - Persistent diarrhea beyond 3 days - Presence of blood in stools - High fever - Signs of severe dehydration - Intense abdominal pain A stool test can confirm bacterial infection if needed. When in doubt, consulting a healthcare provider is recommended, especially for vulnerable populations (young children, elderly, immunocompromised).
Fever and lethargy point toward an infectious cause, as do a diet based on raw meat or recent adoption from a shelter. Food-related diarrhea tends to affect a cat that remains alert and has no fever, following a change in diet.
Do you always need antibiotics?
No. Most cats recover with rehydration and appropriate feeding. Antibiotics are reserved for severe cases or fragile animals, at the veterinarian's discretion.
Can my cat transmit its diarrhea to me?
It's possible with these bacteria. Washing your hands after touching the litter or the cat, and keeping young children away from the litter box, significantly reduces the risk.
Is raw meat really a risk?
Yes. Raw or undercooked meat and poultry are a known source of Salmonella and Campylobacter, both for the cat and for the people who prepare its food.
References
Content reviewed by the TunisieVet editorial team · Updated 11 October 2026
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