What this infection can cause
Feline calicivirus (FCV) is a contagious virus associated with respiratory illness and mouth lesions. It can cause sneezing, discharge, fever and oral ulcers; some cats have pain when eating. Contact with secretions and contaminated objects can spread it.
There are different variants and levels of severity. Signs can resemble other respiratory infections, so a single lesion or sneeze does not confirm calicivirus.
The vaccine helps, but does not cover every situation
Protection against calicivirus is part of the feline combination vaccine. Vaccination helps reduce illness, but does not prevent every infection or provide the same protection against all variants. A vaccinated cat can still become ill and needs assessment if symptoms develop.
Loss of appetite, mouth pain and lethargy warrant a consultation; for breathing difficulty or severe deterioration, seek immediate care at a centre. Call ahead if you suspect a contagious infection.
Documents and questions for the consultation
Gather vaccination dates and labels, as well as any reports you have. If several cats live together, identify each one’s history and explain which cat needs care. When requesting an appointment by message, clarify whether you want a vaccine review or whether there is a current problem so the reason for the visit is clear.
You can bring questions about the available record, missing history and how to continue the preventive plan. You do not need to choose a vaccine yourself based on a photo or a commercial recommendation. The product and arrangements are confirmed during coordination and assessment.
Reinavet appointments
Consultations are by appointment. WhatsApp can be used to check availability, but it is not an on-call veterinary service. Do not wait for a scheduled visit when your cat needs immediate care.
Connect this guide with vaccination
Review the feline combination vaccine and the guides to feline herpesvirus and panleukopenia, the other diseases included in that combination.
Source
Cornell University College of Veterinary Medicine: Information Breakdown — Feline Calicivirus. Accessed 20 October 2026. Educational content; it does not replace a diagnosis.