Feline calicivirus
Also known as FCV, Cat flu (calicivirus).
A very widespread respiratory virus that, as well as sneezing, causes ulcers in the mouth and on the tongue. Some cats remain carriers and develop chronic gingivostomatitis.
If it will not eat because its mouth hurts, or it is a kitten with a fever, do not wait.
- System
- Infectious diseases
- Is it urgent?
- Not usually
- Spreads to other cats
- Yes
- Spreads to people
- No
- Typical cost in Spain
- Consultation and treatment, €60–180.
Highly contagious between cats. It does not pass to people.
Symptoms
- Ulcers on the tongue, palate or nose
- Drooling and pain when eating
- Sneezing and eye discharge
- Fever
- Temporary lameness in kittens
- Very rare: high fever and swelling of the face and legs (virulent strains)
Causes
Feline calicivirus, which mutates a lot and spreads through saliva, secretions and objects. It survives for days on surfaces.
How it is diagnosed
Based on the signs, especially the mouth ulcers. PCR to confirm.
Treatment
Supportive care: pain relief, soft and warmed food, fluids and antibiotics if there is a secondary infection. In chronic mouth cases, treatment is the same as for gingivostomatitis.
No doses, on purpose: any medicine must be prescribed by your vet for your cat.
Prognosis
Good in most cats. The virulent systemic strains are rare but very serious.
Prevention
Core vaccination, which reduces severity. Hygiene and quarantine when bringing in a new cat.
Frequently asked questions
Is feline calicivirus contagious?
To other cats: yes. To people: no. Highly contagious between cats. It does not pass to people.
Can feline calicivirus be cured?
Good in most cats. The virulent systemic strains are rare but very serious. Supportive care: pain relief, soft and warmed food, fluids and antibiotics if there is a secondary infection. In chronic mouth cases, treatment is the same as for gingivostomatitis.
How much does it cost to treat feline calicivirus?
As a guide for Spain in 2026: Consultation and treatment, €60–180. Prices vary a lot between clinics and cities, and out-of-hours emergencies cost more.
How can feline calicivirus be prevented?
Core vaccination, which reduces severity. Hygiene and quarantine when bringing in a new cat.
More in infectious diseases
Educational content from Michipedia. It does not replace diagnosis or treatment by a vet: if you have any doubt about your cat's health, ask. Costs are a guide for Spain in 2026.