The FVRCP vaccine is a combination shot that protects cats against three common viruses: feline viral rhinotracheitis (caused by feline herpesvirus), calicivirus and panleukopenia, also called feline distemper. It's a core vaccine, so it's recommended for every cat, including the ones who've never been past the front door.
Kittens get it as a series of doses, then a booster around their first birthday. After that, adults get boosters on a schedule your vet sets. Here's what each letter protects against, why it matters for indoor cats too, how the usual schedule works and which side effects to watch for. Your vet decides the right plan for your cat.
What does FVRCP stand for?
FVRCP stands for feline viral rhinotracheitis, calicivirus and panleukopenia. Three diseases, one shot:
| Letters | Disease | What it does |
|---|---|---|
| FVR | Feline viral rhinotracheitis (feline herpesvirus) | Upper respiratory infection, eye ulcers and fever |
| C | Feline calicivirus | Upper respiratory illness, mouth ulcers, sometimes pneumonia |
| P | Panleukopenia (feline distemper, feline parvovirus) | Vomiting, diarrhea, fever; can be deadly, especially in kittens |
The World Small Animal Veterinary Association (WSAVA) lists all three as core vaccines for cats worldwide. Rabies is the other core vaccine for adult cats, and it's given as a separate shot.
How serious are the diseases the FVRCP vaccine covers?
Serious enough that vets want every cat covered. Panleukopenia can kill, and the other two are among the most common causes of cat flu.
Panleukopenia
The Cornell Feline Health Center describes panleukopenia as highly contagious and potentially deadly. It spreads through feces, vomit, urine and nasal discharge, and on bedding, bowls, hands and clothing. Without proper disinfection it can survive indoors for up to about a year, and it even survives freezing. Signs include vomiting, diarrhea, fever, lethargy and not eating, and sudden death is most often seen in kittens under five months old.
Feline herpesvirus
Cornell says most cats are exposed to feline herpesvirus at some point, and most of them stay infected for life. Up to 45 percent of infected cats shed the virus now and then, usually when they're stressed. It causes sneezing, eye and nose discharge, eye ulcers and fever, and it's hardest on young and unvaccinated cats.
Calicivirus
Calicivirus is everywhere. Cornell reports that about 10 percent of cats in small groups are infected, rising to as many as 90 percent in crowded places like shelters. It brings respiratory signs and mouth ulcers, and it can spread to the lungs. A rare severe form is fatal in about two thirds of affected cats.
Does the FVRCP vaccine stop infection completely?
Not every part of it. Cornell explains that the herpesvirus vaccine doesn't prevent infection in every case, but it greatly reduces how sick a cat gets and how much virus it sheds. The calicivirus vaccine isn't 100 percent protective either, though it lowers the chance of severe disease. For panleukopenia, vaccination is the main way to prevent it.
Think of the respiratory parts of FVRCP as protection against severe illness, and the panleukopenia part as protection against a disease that can kill.
Does an indoor cat need the FVRCP vaccine?
Yes. Cornell recommends the panleukopenia vaccine, which is part of FVRCP, for all cats, indoor cats included, because the virus is widespread in the environment and can come in on shoes, clothing and hands. Think about everything that crosses your doormat in a week.
Cornell's vaccine guidance also recommends all the core vaccines for cats kept indoors full time. Our post on core vaccines for cats covers the full list.
The FVRCP vaccine schedule for kittens and adults
The usual FVRCP schedule starts at 6 to 8 weeks and runs to a booster at one year. Cornell describes it like this, and your vet may adjust it for your cat:
- A first dose at 6 to 8 weeks of age.
- Repeat doses every 3 to 4 weeks until 16 to 20 weeks of age.
- A booster at one year of age.
- Adult boosters every year for the intranasal vaccine, or every three years for the injectable one.
Why so many kitten doses? Antibodies from the mother can block early vaccines. WSAVA recommends giving the last kitten dose at 16 weeks or older, followed by revaccination at or after 26 weeks, and says core vaccines shouldn't be given more often than necessary.
Adopting an adult cat with no known history, like a rescue? Cornell says that cat is usually treated as unvaccinated and given the starting series.
What side effects can the FVRCP vaccine cause?
Most cats have no problem at all. Cornell notes that short-term reactions are mainly allergic, and that all feline vaccines carry a small, uncommon long-term risk of a tumour at the injection site. For most cats, Cornell says, the benefits of a proper vaccination schedule outweigh those risks.
Before the shot, tell your vet about any past reaction. Afterward, keep an eye on your cat for the rest of the day, and mention any lump at the injection site that doesn't go away. If your cat has trouble breathing or seems very unwell, go to a vet or emergency clinic right away.
Questions to ask your vet about FVRCP
A few questions worth asking while you're in the exam room:
- Is my cat due for a booster, and is it the injectable or the intranasal vaccine?
- How long will this dose protect my cat?
- Does my cat's lifestyle, like boarding or other cats at home, change the plan?
- What should I watch for tonight, and when should I call you?
Keep the dates where you can find them
Catteries, groomers and cat sitters often want proof of vaccination. Add each FVRCP dose and its next due date to your cat's pet records in the free PetGrid app, set a reminder for the booster, and share a vaccine card when a boarding place asks.
Questions people ask
What does the FVRCP vaccine protect against?
It protects against feline viral rhinotracheitis (feline herpesvirus), calicivirus and panleukopenia. All three are core diseases for cats, according to WSAVA.
How often does my cat need an FVRCP booster?
After the kitten series and a booster at one year, Cornell describes boosters every year for the intranasal vaccine or every three years for the injectable one. Your vet sets the schedule for your cat.
Is FVRCP the same as the feline distemper vaccine?
The distemper part is the P, for panleukopenia. FVRCP combines that with protection against herpesvirus and calicivirus in one shot.
Can a vaccinated cat still get a cold?
Yes, it can. Cornell says the herpesvirus and calicivirus vaccines make the illness less severe but don't prevent every infection.
My indoor cat never goes out. Does it still need FVRCP?
Yes. Cornell recommends it for all cats, because panleukopenia is widespread in the environment and can be carried in on shoes, hands and clothing.
The short version
FVRCP is one shot against three viruses: a deadly gut infection and two of the usual culprits behind cat flu. Kittens need a series, every cat needs a booster at one year, and adults follow the schedule your vet recommends. Indoor cats too.
Keep each dose and its next due date in one place, so a booster never slips by. The PetGrid app is free for pet owners.
Keep your pet's records, vaccines and visits in one safe place. The PetGrid app is free for pet owners, with or without a clinic.
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