Vaccination is a fundamental part of preventive healthcare for cats. While some vaccines are considered core and essential for all cats, others are non-core and recommended based on lifestyle and risk. This article explains the common vaccines for cats, what they protect against, typical schedules, and potential side effects so you can discuss the best plan with your veterinarian.
FVRCP (Distemper) — Core Cat Vaccine
FVRCP is a combination vaccine that protects kittens and cats from three serious infectious diseases. It is considered a core vaccine because it prevents illnesses that can be life-threatening, particularly in young or unvaccinated animals. The combination fosters active immunity and is given initially to kittens and later boosted throughout adulthood.
The FVRCP vaccine covers:
- FPV (feline panleukopenia): This highly contagious viral disease can be fatal in kittens. The virus attacks white blood cells and often causes lethargy, loss of appetite, vomiting, and severe diarrhea.
- FCV (feline calicivirus): Caliciviruses cause upper respiratory infections and may contribute to oral diseases like gingivitis and stomatitis. Clinical signs range from sneezing and nasal discharge to mouth ulcers, and in some cases skin lesions or more severe systemic effects.
- FHV-1 (feline herpesvirus type 1): Often called feline viral rhinotracheitis, this virus causes respiratory illness with sneezing, congestion, ocular discharge, and conjunctivitis. Infected cats can develop mouth sores or pneumonia, and the virus can establish lifelong latent infections that may reactivate.
Recommended schedule
- First doses: typically at 6–8 weeks of age
- Follow-up doses: at 10–12 weeks and 14–16 weeks
- First adult booster: around 1 year of age
- Subsequent boosters: usually every three years, depending on veterinary guidance and vaccine type
Possible side effects
Most cats experience no more than mild, short-lived reactions following FVRCP vaccination: slight fever, decreased energy, or minor swelling at the injection site. Rare but more serious allergic reactions can occur within minutes to 48 hours and may include hives, facial swelling, itching, vomiting, diarrhea, or difficulty breathing. Any concerning signs after vaccination should be treated as an emergency.
Rabies — Core Cat Vaccine
Rabies is a fatal viral disease that affects the nervous system of mammals. Because it is almost always fatal once clinical signs appear, rabies vaccination is a core requirement and is mandated by law in many jurisdictions. The virus is transmitted primarily through saliva, typically via bites, but can also spread through open wounds.
Because diagnostic confirmation of rabies historically requires examination of brain tissue, an unvaccinated cat that is exposed to a rabid animal may be subject to strict quarantine or, in some regions, euthanasia. Vaccination is the most effective and humane prevention and is strongly advised regardless of a cat’s indoor/outdoor status.
Recommended schedule
- Initial vaccination: usually at 14–16 weeks of age
- Boosters: annually or every three years depending on vaccine type and local regulations
Possible side effects
Adverse reactions to the rabies vaccine are uncommon. Mild effects may include low-grade fever, decreased appetite, lethargy, or temporary swelling at the injection site. Rare allergic reactions can present with facial swelling, hives, severe weakness, or collapse; such events are uncommon but require immediate veterinary attention.
FeLV (Feline Leukemia Virus) — Non-Core Cat Vaccine
The FeLV vaccine protects against feline leukemia virus, which spreads primarily through close contact and bodily secretions such as saliva, urine, and feces. Transmission commonly occurs through mutual grooming, shared food bowls, or prolonged contact. FeLV weakens the immune system and increases susceptibility to other infections and certain cancers.
FeLV vaccination is especially recommended for kittens and for cats that go outdoors or live with FeLV-positive animals. For strictly indoor cats with no exposure risk, the vaccine may be optional—your veterinarian can help assess the need based on your cat’s lifestyle and local risks.
Possible side effects
Side effects are typically mild and may include temporary lethargy, low-grade fever, itchiness, or localized swelling. Rarely, more severe allergic reactions can cause difficulty breathing, vomiting, diarrhea, pale gums, or collapse and require urgent care.
Bordetella bronchiseptica — Non-Core Cat Vaccine
Bordetella vaccination is optional and is generally considered for cats at higher risk of respiratory exposure, such as those in shelters, boarding facilities, or multi-cat households where the bacterium is known to circulate. The vaccine helps reduce the risk of contagious respiratory disease.
It is often given around 16 weeks of age or earlier depending on formulation and risk. Mild transient sneezing or nasal discharge can occur but typically resolves within a few days. Report any other unusual signs to your veterinarian.
Chlamydophila felis — Non-Core Cat Vaccine
Chlamydophila felis causes conjunctivitis and upper respiratory signs in cats. It is more likely to be a concern in multi-cat environments, shelters, or catteries with a history of infection. Vaccination can begin as early as 8 weeks of age, with annual boosters recommended when the vaccine is indicated.
Adverse effects are usually minor—short-lived fever, decreased appetite, injection-site soreness, or mild lethargy. These signs generally resolve quickly.
Choosing the appropriate vaccines for your cat depends on age, health status, environment, and local disease risk. Core vaccines (FVRCP and rabies) protect against diseases that are widely prevalent and potentially severe, while non-core vaccines (FeLV, Bordetella, Chlamydophila) are selected based on exposure risk. Discuss your cat’s lifestyle and health history with your veterinarian to create a tailored vaccination plan that balances protection and safety.
Maintaining vaccinations alongside good nutrition and routine veterinary care helps support your cat’s immune system and overall wellbeing. Ask your veterinarian to explain the benefits and potential risks of each vaccine so you can make informed decisions for your cat’s health.