Is Stomatitis in Cats Contagious to Other Pets or People?
By Dr. Zubair Khalid, DVM, MS, PhD ·
Stomatitis in cats contagious? The short answer is no. The painful mouth inflammation itself does not spread from one pet to another or to people. What can spread are some of the viruses and bacteria that trigger or worsen it, especially between cats living in the same home.
This article is educational and is not a substitute for veterinary diagnosis or treatment.
Quick Answer
- Stomatitis is inflammation inside a cat's mouth, and the inflammation is not an infection you can catch or pass on.
- The underlying triggers, such as feline calicivirus, feline immunodeficiency virus (FIV), and feline leukemia virus (FeLV), can spread between cats [1].
- People do not catch feline stomatitis, and dogs do not develop it from a cat with the condition.
- Some mouth bacteria in cats have zoonotic potential, meaning they can infect people, usually through a bite or scratch instead of casual contact [2].
- If your cat has mouth pain, book a veterinary visit. Home remedies and waiting rarely help.
What Stomatitis in Cats Actually Is
Stomatitis means inflammation of the soft tissues in the mouth. In cats, the term usually describes a severe, long-lasting form called feline chronic gingivostomatitis (FCGS). The gums, cheeks, tongue, and the area around the back teeth become red, swollen, and painful [3].
This is not a simple case of bad breath or a little tartar. FCGS is an immune-driven reaction. The cat's own immune system overreacts to plaque and to viruses in the mouth, and the result is ongoing tissue damage. That is why the condition often keeps coming back even when owners brush teeth or clean the mouth carefully.
Because the problem sits in the immune response, not in a single germ, you cannot "catch" stomatitis the way you catch a cold. A healthy cat living with a cat that has FCGS will not develop FCGS just from sharing a food bowl.
Signs Owners Notice First
Cats hide mouth pain well. By the time you see obvious signs, the disease may be advanced.
- Drooling, sometimes with blood
- Bad breath that does not improve with dental care
- Crying out or dropping food while eating
- Eating on one side of the mouth or preferring soft food
- Weight loss and reduced grooming
- Pawing at the face or flinching when you touch the cheeks
- Irritability, hiding, or avoiding the food bowl
In one study of cats with feline infectious peritonitis, FCGS was present in 25 of 97 cats, and calicivirus infection was linked to the condition [1]. That does not mean every cat with calicivirus gets stomatitis. It means the virus is one piece of a larger puzzle.
Is Stomatitis in Cats Contagious? What Can and Cannot Spread
This is the question most owners really want answered, so let's separate the pieces.
What does not spread: The inflammation itself. If your cat has red, ulcerated gums, another cat in the house will not "catch" that redness. People in the home are not at risk of developing feline stomatitis either.
What can spread: Several infectious agents linked to mouth disease in cats.
| Agent | Spreads between cats? | Spreads to people? | Notes |
|---|---|---|---|
| Feline calicivirus (FCV) | Yes, easily | No | Common in cats with FCGS [1] |
| Feline immunodeficiency virus (FIV) | Yes, mainly through bites | No | More common in males and outdoor cats [4] |
| Feline leukemia virus (FeLV) | Yes, through close contact | No | Can suppress immunity |
| Bartonella species | Through fleas, possibly scratches | Yes, rarely | Detected in 15.4% of cats in one island population [2] |
| Toxoplasma gondii | Through prey and soil | Yes, for some people | Not a direct cause of stomatitis |
So the honest answer is layered. Stomatitis is not contagious, but the infections that set the stage for it can move between cats [1]. That is why a new cat with mouth problems should be tested before joining a household with other cats.
If you are worried about infections that pass from cats to people, our guide on Toxoplasma in cats and immunocompromised owners explains who is most at risk and how to reduce exposure.
Causes and Risk Factors
FCGS is best understood as a syndrome with several contributors instead of one single cause.
Viruses. Calicivirus is the virus most consistently tied to FCGS. In cats being treated for feline infectious peritonitis, calicivirus was found in 27 of 100 cats, and FCV infection was significantly associated with FCGS [1]. FIV and FeLV also appeared in that group, though at lower numbers [1].
Immune status. Cats with FIV are immunosuppressed and more likely to develop opportunistic problems [4]. In a study of 105 cats from clinics and shelters, FIV antibodies were found in 10.5% of cats and were more common in males, young cats, and cats with clinical signs [4].
Age and lifestyle. Young cats and pet cats showed higher rates of some infections in that same study [4]. Outdoor access, crowded shelter conditions, and fighting all raise exposure risk.
Dental and oral factors. Plaque buildup, broken teeth, and ongoing gum disease feed the inflammatory cycle. This is why dental treatment is part of management even when a virus is involved.
Other infections. Bartonella and haemotropic Mycoplasma species circulate in cat populations, with Bartonella detected in 15.4% and Mycoplasma in 34.2% of cats in one tropical island study [2]. Their exact role in stomatitis is not well established in veterinary research.
How Veterinarians Diagnose It
There is no single blood test that says "stomatitis." Diagnosis comes from putting several pieces together.
Your veterinarian will start with a full oral exam, sometimes under sedation because the mouth is too painful to inspect awake. They will look for redness, ulcers, and swelling, and they will check for broken or resorbed teeth.
Next comes testing for the infections that can sit behind the disease. FIV and FeLV testing is standard, and calicivirus testing may be added depending on your cat's history [1]. Because FIV and other infections can occur together, a positive result on one test often prompts a broader look [4][1].
Blood work helps assess overall health, organ function, and inflammation. In treatment studies, markers such as white blood cell counts, total protein, albumin, globulin, and serum amyloid-A have been used to track response [3].
Dental X-rays are important. They reveal tooth root problems that are invisible above the gumline and that may be driving pain.
If your cat also sneezes or has nasal discharge, that points toward an upper respiratory component. Our article on cat sneezing and its common causes covers what those signs usually mean.
Treatment Options
Treatment is usually staged, and it takes patience. No single drug cures FCGS.
Pain control and anti-inflammatory support. This comes first. A cat in pain will not eat, and poor nutrition slows everything else. Your veterinarian calculates doses from your cat's weight and health status.
Dental treatment. Full-mouth or partial tooth extraction is the most established surgical option. It removes the plaque surface the immune system is reacting to. Even so, the cure rate of tooth extraction alone is not high enough on its own, which is why other treatments are often combined with it [3].
Antiviral and antibacterial therapy. A study of 52 cats with suspected FCGS compared 22 tooth-extracted cats with 30 cats that had not had extractions. All received oral antiviral and antibacterial treatment first, followed by the antiviral alone as maintenance. The active ingredients identified were moxifloxacin and molnupiravir. Weight, appetite, activity, grooming, drooling, and redness all improved significantly, and white blood cell counts, neutrophils, monocytes, total protein, albumin, globulin, and serum amyloid-A also changed with treatment [3]. This does not mean these drugs are right for every cat. It means combination therapy is an active area of veterinary care, and your veterinarian decides what fits your cat.
Immune modulation. Some cats need medications that calm the overactive immune response. These carry risks and require monitoring.
Nutrition support. Soft food, warmed food, and sometimes feeding tubes help cats maintain weight during treatment.
Treating coinfections. If FIV, FeLV, or another infection is present, managing it supports the mouth [4][1].
Recovery, Outlook, and Long-Term Management
Recovery varies widely. Some cats improve dramatically after extractions and never need much more. Others need ongoing medication and regular checkups.
Expect repeat visits. Your veterinarian will track weight, appetite, and comfort at each visit, and may recheck blood markers that reflect inflammation [3].
At home, keep a simple log. Note how much your cat eats, whether drooling returns, and whether grooming changes. These small observations guide treatment better than a single exam.
Dental hygiene still matters for any remaining teeth. Ask your veterinarian which products are safe for your cat.
Keep stress low. Multi-cat homes should have separate feeding stations, water bowls, and litter boxes to reduce tension and the chance of bites.
Prevention
You cannot prevent every case of stomatitis, but you can lower the odds.
- Test new cats for FIV and FeLV before they join your home [4][1].
- Keep cats indoors to reduce fights and exposure to infected saliva.
- Stay current on core vaccines, including calicivirus.
- Control fleas, since Bartonella spreads through fleas and can infect people too [2].
- Schedule dental cleanings and address gum disease early.
- Feed a balanced diet and keep your cat at a healthy weight.
- Watch for early mouth signs and act quickly.
If your cat has skin or coat problems alongside mouth issues, some conditions that look similar are covered in our articles on ringworm in cats and whether cats can get psoriasis. Neither is contagious in the way people often fear, but both need a diagnosis.
Limitations and When to Contact a Veterinarian
Stomatitis research is still evolving. The exact mix of viruses, bacteria, and immune factors differs from cat to cat, and no test or treatment works for every patient. Individual cases need a veterinarian who can examine your cat and tailor a plan.
Contact your veterinarian the same day if your cat:
- Stops eating or drinking for more than 24 hours
- Drools heavily or drools blood
- Cries when trying to eat
- Has visible ulcers or bleeding in the mouth
- Loses weight or stops grooming
Seek emergency care now if your cat:
- Cannot swallow at all
- Has trouble breathing
- Collapses or seems weak
- Has a swollen face or neck that is getting worse
Book a routine visit if your cat:
- Has bad breath that does not improve
- Eats slowly or drops food
- Has been diagnosed with FIV or FeLV and has not had a recent mouth exam [4][1]
Frequently Asked Questions
Can cats catch stomatitis from each other?
No, the inflammation itself is not contagious. However, cats can pass calicivirus, FIV, and FeLV to one another, and those infections raise the risk of mouth disease [1]. Testing new cats before they join a household is the practical step that matters most.
Can people get stomatitis from a cat?
People do not develop feline stomatitis. A person could theoretically be exposed to Bartonella through a bite or scratch, since that bacterium has zoonotic relevance [2]. Normal petting and sharing a home are not a realistic route of transmission.
Does stomatitis go away on its own?
It rarely resolves without treatment. FCGS is a chronic, immune-driven condition, and cats typically need dental care, medication, or both [3]. Waiting allows pain and weight loss to worsen.
Should I isolate my cat with stomatitis from other pets?
Isolation is not needed for the inflammation itself. If your cat has not been tested for FIV, FeLV, or calicivirus, keep food bowls and water bowls separate until your veterinarian advises you [1]. Bite wounds are the main route for FIV spread, so preventing fights matters more than separating rooms [4].
Can stomatitis come back after tooth extraction?
Yes, it can. Tooth extraction helps many cats, but the cure rate is not high enough on its own, and some cats still need ongoing antiviral or immune-directed treatment afterward [3]. Regular checkups help catch a relapse early.
Related Articles
- Cat Sneezing a Lot: Allergies, Infection, or Something Else?
- Toxoplasma in Cats: Zoonotic Risk and Immunocompromised Owners
- Can Cats Get Psoriasis
- Ringworm In Cats
- Cat Sneezing: Common Causes and When to Worry
- Why Is My Cat So Itchy?
- Is Gingivitis in Cats Contagious? What You Need to Know
- Is Feline Herpes Contagious to Other Cats? What to Know
- Is FIP or FIV Contagious to Other Cats?
References
- Viral Coinfections Potentially Associated with Feline Chronic Gingivostomatitis in Cats with Feline Infectious Peritonitis. Viruses, 2025.
- Mycoplasma and Bartonella in cats from the tropical tourist Gili Islands, Indonesia. Acta tropica, 2026.
- Combination Therapeutic Effect of Antibacterial and Antiviral Agents on Feline Chronic Gingivostomatitis Nonbounded to Prior Tooth Extraction Confirmed by Physical Signs and Clinical Biomarkers. Veterinary sciences, 2026.
- Seroprevalence of Toxoplasma gondii and Feline Immunodeficiency Virus in Domestic Cats and Their Associations with Clinical Signs. Acta parasitologica, 2026.