Why Do Cats Need Vaccinations?
Vaccination is one of the most effective ways to prevent infectious diseases. According to the WSAVA (World Small Animal Veterinary Association) 2016 Vaccination Guidelines, vaccines are classified into core vaccinesand non-core vaccines. Core vaccines are recommended for all cats because the corresponding diseases have high mortality or are highly contagious.
Core Vaccines (Essential Vaccines)
| Vaccine | Disease Prevented | Disease Description |
|---|---|---|
| FPV | Feline Panleukopenia | Highly contagious with an extremely high mortality rate (up to 90% in kittens); the virus can survive in the environment for over a year |
| FHV-1 | Feline Herpesvirus (Feline Viral Rhinotracheitis) | Causes upper respiratory infections; infected cats become lifelong carriers and may relapse during stress |
| FCV | Feline Calicivirus | Causes upper respiratory infections and oral ulcers; severe strains can lead to systemic infection |
| Rabies | Rabies | A zoonotic disease with a near 100% fatality rate; vaccination is required by law in many regions |
The FVRCP combination vaccine (FPV + FHV-1 + FCV) covers the first three core vaccines. Rabies vaccination is mandated by animal disease prevention regulations in many jurisdictions.
Non-Core Vaccines (Risk-Based)
| Vaccine | Disease Prevented | Recommended For |
|---|---|---|
| FeLV | Feline Leukemia Virus | Outdoor cats, cats in contact with carriers, shelter cats. AAFP recommends vaccination for all kittens under 1 year of age |
| FIV | Feline Immunodeficiency Virus | High-risk environments (e.g., outdoor male cats that fight), though vaccine efficacy remains debated |
| Chlamydia | Feline Chlamydial Infection | Multi-cat environments with a history of the disease |
Recommended Vaccination Schedule
The following schedule is based on the WSAVA 2016 guidelines and AAFP 2020 recommendations:
| Age | Vaccine | Notes |
|---|---|---|
| 6–8 weeks | FVRCP (1st dose) | Begin primary immunization |
| 10–12 weeks | FVRCP (2nd dose) | Booster every 2–4 weeks |
| 14–16 weeks | FVRCP (3rd dose) + Rabies | Final dose must be given at 16 weeks of age or older |
| After 6 months | Spay/neuter surgery | Vaccination status can be reassessed at the follow-up visit |
| 1 year | FVRCP booster + Rabies booster | Final booster to complete primary immunization |
| Every 3 years thereafter | FVRCP | WSAVA recommends boosting core vaccines every 3 years |
| Per local regulations | Rabies | Many jurisdictions require annual rabies vaccination |
The WSAVA 2016 guidelines specifically emphasize that core vaccines should not be administered more frequently than necessary. Studies show that the Duration of Immunity (DOI) of the FVRCP vaccine can last 7 years or more (Schultz, 2006,Veterinary Microbiology), making a 3-year booster interval sufficient. Over-vaccination unnecessarily increases the risk of Feline Injection-Site Sarcoma (FISS).
Feline Injection-Site Sarcoma (FISS)
Feline Injection-Site Sarcoma (FISS) is a rare but serious tumor associated with vaccines or other injections. According to a review in The Veterinary Journal (Hartmann et al., 2015), the incidence is approximately 1 case per 10,000–30,000 injections.
AAFP-recommended preventive measures include:
- Administering vaccines in the distal limbs rather than between the shoulder blades
- Using adjuvant-free vaccines
- Avoiding unnecessary repeat injections
- Recording injection sites and rotating locations for each administration
Do Indoor Cats Still Need Vaccinations?
Yes. Even for strictly indoor cats, the WSAVA still recommends core vaccinations for the following reasons:
- Cats may accidentally escape
- Owners may bring pathogens home from outside (on shoes, clothing)
- The cat may need to be hospitalized or boarded in the future
- A new cat may join the household
- Rabies vaccination is a legal requirement in many areas
References
- WSAVA Vaccination Guidelines Group. (2016). Guidelines for the Vaccination of Dogs and Cats. Journal of Small Animal Practice, 57(1), E1-E45.
- Scherk, M.A. et al. (2013). AAFP Feline Vaccination Advisory Panel Report. Journal of Feline Medicine and Surgery, 15(9), 785-808.
- Schultz, R.D. (2006). Duration of immunity for canine and feline vaccines: A review. Veterinary Microbiology, 117(1), 75-79.
- Hartmann, K. et al. (2015). Feline injection-site sarcoma: ABCD guidelines on prevention and management. Journal of Feline Medicine and Surgery, 17(7), 606-613.