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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsFeline calicivirus (FCV) is a contagious virus that commonly causes respiratory illness and painful mouth ulcers in cats. Many cats recover with supportive veterinary care, but FCV can resemble other infections, and rare virulent systemic cases can become life-threatening. Vaccination reduces the risk of severe disease but does not prevent every infection.
What does feline calicivirus do to cats?
FCV can cause illness ranging from mild, short-lived respiratory signs to more serious disease. Common signs include sneezing, congestion, nasal or eye discharge, fever, drooling, lethargy, reduced appetite, and ulcers on the tongue or inside the mouth. Mouth pain or congestion may make eating difficult.
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Some cats develop lameness, and infection can extend into the lungs and cause pneumonia. Secondary bacterial infections can complicate the illness. Chronic inflammation of the gums or mouth is also reported in some cats. Symptoms may last weeks in more severe cases.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →How is ordinary FCV different from virulent systemic disease?
Most FCV illness is respiratory or oral. Rarely, a virulent systemic form, often called FCV-associated virulent systemic disease (FCV-VSD), can affect multiple organs and cause severe illness.
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| Feature | Common FCV infection | FCV-VSD |
|---|---|---|
| Typical signs | Sneezing, discharge, fever, drooling, and mouth ulcers | May include high fever, swelling of the head or limbs, crusting skin sores, jaundice, or bleeding |
| Care needs | Veterinary assessment and supportive care; severity varies | Urgent veterinary attention; severe cases may require intensive care |
| Reported outcome | Many cats recover, though complications can occur | Cornell University College of Veterinary Medicine reported in 2019 that FCV-VSD is fatal in up to 60% of cats that develop the disease. This figure applies to cats with FCV-VSD, not to cats with ordinary FCV infection. |
These conditions should not be treated as equally likely outcomes: FCV-VSD is rare, while respiratory and oral illness are the familiar presentation.
Is feline calicivirus contagious?
Yes. FCV spreads between cats through saliva, nasal mucus, and eye discharge; sneeze droplets; and contaminated objects such as bowls, bedding, and litter equipment. People can also transfer contaminated material on their hands or belongings. Shelters, catteries, and other multi-cat settings are particular risk environments.
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Cornell reports that 25–40% of cats in shelters, pet stores, and catteries may be carriers. That estimate is specific to those settings and is not a prevalence figure for household cats.
Cats commonly shed FCV for two to three weeks after infection, and some become carriers that shed intermittently for months. The virus may persist on surfaces, but estimates differ by source and conditions: Cornell reports survival for up to a month in some conditions, while VCA gives a shorter estimate. There is no single duration that applies to every environment.
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How will a veterinarian diagnose FCV?
A veterinarian may suspect FCV from respiratory signs together with oral ulcers, but symptoms alone cannot confirm it. Feline herpesvirus and other pathogens can cause overlapping signs, and cats can have mixed infections.
When testing is useful, a veterinarian may use reverse-transcriptase PCR on appropriate samples or virus isolation. Results need to be interpreted alongside the cat’s signs, timing of sampling, and exposure history. Testing may be especially useful in outbreaks or when identifying the cause would affect management.
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- A positive result does not by itself prove FCV is causing the current illness: healthy cats may carry or shed the virus.
- Recent modified-live vaccination may affect test results.
- Routine commercial tests do not distinguish mild FCV strains from strains associated with FCV-VSD.
What treatment helps a cat with calicivirus?
No drug directly eliminates FCV. Treatment is supportive and tailored by a veterinarian to the cat’s condition. It may address hydration, nutrition, pain, congestion, and secondary bacterial infections when indicated. Antibiotics do not treat the virus itself.
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Cornell suggests offering soft, strong-smelling food when mouth sores or congestion make eating difficult. This may help encourage intake, but it does not treat the infection. Contact a veterinarian if the cat persistently will not eat or has serious symptoms. Severe illness, dehydration, breathing difficulty, or sustained inability to eat may require hospitalization or intensive care.
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Can vaccination prevent FCV?
FCV vaccination is part of core feline vaccination guidance. Because the virus varies, vaccination does not guarantee that a cat will avoid infection or illness; its important benefit is reducing disease severity. The appropriate timing depends on factors such as age, previous doses, vaccine product, risk setting, and local veterinary guidance, so ask the cat’s veterinarian for an individual schedule.
How can you reduce spread at home?
- Separate sick cats when practical. Keep them apart from other cats and limit shared items while they are ill.
- Wash your hands. Clean your hands after handling a sick cat or objects contaminated with its secretions.
- Clean contaminated items carefully. Follow the product label and use only cleaning products and procedures safe for cats; keep animals away as directed.
- Remember that signs ending may not mean shedding has ended. Some cats continue to shed after they appear to recover.
Can people catch FCV from cats?
Merck Veterinary Manual states that feline respiratory viruses, including FCV, are host-specific and pose no known human risk. Good hand hygiene remains useful for limiting transfer of secretions and contamination between cats.
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