Feline Calicivirus: The Common Cold Your Cat's Vaccine Prevents

In this guide

Feline calicivirus, usually shortened to FCV, is one of the most common infectious causes of upper respiratory illness in cats worldwide, alongside feline viral rhinotracheitis. It is the C in the FVRCP vaccine your kitten receives as part of its core vaccination series, and understanding what it does helps explain why that vaccine matters so much.

How it spreads

FCV is highly contagious and spreads through direct contact with an infected cat's saliva, nasal discharge or eye discharge, as well as through contaminated bowls, bedding and litter boxes. It moves particularly fast through multi cat households, shelters and breeding environments, though even homes with just one or two cats are not immune.

What it looks like

• Sneezing and nasal discharge
• Conjunctivitis and watery or goopy eye discharge
• Mouth ulcers, particularly on the tongue, which often cause drooling and a reluctance to eat
• Fever and general lethargy
• In some strains, joint pain and limping, sometimes called limping syndrome
• Rarely, in severe systemic strains, more serious symptoms affecting multiple organs

Most cats, especially adults, recover within seven to ten days with supportive care. Kittens and cats with weaker immune systems can be affected more seriously.

Treatment

There is no medication that kills the virus directly, so treatment focuses on supportive care: keeping the cat hydrated, encouraging eating despite mouth discomfort, sometimes with softer or warmed food, and treating any secondary bacterial infection with antibiotics if it develops. A steamy bathroom for ten to fifteen minutes a couple of times a day can help ease nasal congestion, similar to a human cold.

Why the vaccine matters

Even a vaccinated cat can occasionally catch a mild version of FCV, since the virus has many circulating strains and no vaccine covers every one of them. What vaccination reliably does is reduce the severity and duration of illness if infection does occur. Some recovered cats become long term carriers, continuing to shed the virus periodically without looking sick themselves, which is part of why the disease persists so easily in cat populations.

Practical prevention

• Keep your kitten on schedule for the full FVRCP series, followed by the recommended boosters
• If you are fostering, adopting from a shelter, or introducing a new cat to a multi cat home, a period of separate housing and monitoring reduces the risk of spreading FCV to your existing cats
• Wash food and water bowls regularly, and avoid sharing them between cats in a multi cat household during an active illness

Tags: feline calicivirus, FCV, cat respiratory infection, Indian pet care

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