Cat Health
Cat Vaccination Schedule UK — Kitten Shots & Annual Boosters
Published Last updated 3 min read
Quick answer
UK kittens typically start vaccinations at 9 weeks, with a second injection 3–4 weeks later. Core vaccines protect against cat flu and feline enteritis; outdoor or multi-cat households may also need FeLV vaccination. Keep boosters up to date even for indoor cats.
Core vaccines for UK cats
According to the PDSA and RSPCA, the essential UK cat vaccination course protects against:
| Component | Disease protected |
|---|---|
| Feline herpesvirus (FHV) | Part of "cat flu" — respiratory signs |
| Feline calicivirus (FCV) | Part of "cat flu" — mouth ulcers, lameness |
| Feline parvovirus (FPV) | Feline enteritis / panleukopenia — often fatal in kittens |
Cat flu is not a single illness — it is a syndrome caused by several viruses. Vaccination reduces severity and spread but does not guarantee complete immunity in every cat. Regular boosters maintain protection as maternal antibodies from the queen fade.
Kitten vaccination schedule
According to Blue Cross guidance, a standard UK kitten schedule is:
- First vaccination: from 9 weeks (some practices use 8–9 weeks depending on product)
- Second vaccination: 3–4 weeks after the first
- Outdoor access: usually safe 1–2 weeks after the final primary injection, once your vet confirms
Kittens from rescue centres may arrive partially vaccinated. Bring any paperwork to your vet so they can plan the remaining course without unnecessary duplication or gaps.
If you adopt an older kitten with unknown history, your vet may recommend starting or completing a primary course before allowing contact with unvaccinated cats.
Feline leukaemia virus (FeLV)
According to the BVA and PDSA, FeLV vaccination is recommended for cats with outdoor access or those living with FeLV-positive cats. It is a serious immunosuppressive virus spread through mutual grooming, bites and shared bowls.
Indoor-only cats with no contact with outdoor cats may not need FeLV vaccination — this is a discussion for your vet based on your household's risk. FeLV requires a blood test before vaccination in some protocols if exposure history is unknown.
Boosters and indoor cats
According to the RSPCA, indoor cats still benefit from vaccination because:
- Human footwear and clothing can carry viruses
- Escapes and window encounters with other cats happen
- Boarding catteries require up-to-date vaccination records
Booster intervals vary by vaccine manufacturer and UK practice policy — commonly annual for cat flu components and less frequent for enteritis in some protocols. Your vet records what was given and when the next visit is due.
Cattery and multi-cat requirements
According to Blue Cross, most UK boarding catteries require:
- Full primary course completed
- Booster within the last 12 months (some catteries specify 12 months exactly — check their policy)
- FeLV vaccination if your cat goes outdoors
In multi-cat households, vaccinate all cats on a coordinated schedule. Isolate new arrivals until a vet confirms their vaccination and health status to reduce disease introduction.
After vaccination
Most kittens and cats show minimal reaction. Mild lethargy or reduced appetite for 24 hours can occur. Contact your vet urgently for facial swelling, breathing difficulty or collapse.
Never vaccinate a cat that is acutely unwell without veterinary assessment. Pregnancy and certain illnesses may affect timing — your vet will advise.
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-25).
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Frequently Asked Questions
- When should kittens be vaccinated in the UK?
- Kittens usually start vaccinations from around 9 weeks of age, with a second injection 3–4 weeks later. Some vets begin slightly earlier in specific circumstances — always follow your practice's schedule.
- Do indoor cats need vaccinations?
- Yes. Viruses can enter homes on shoes, clothing or through window contact with other cats. Cat flu and enteritis vaccines are recommended for indoor cats as well as outdoor ones.
- How often do cats need booster vaccinations?
- Most UK cats receive booster vaccinations every 1–3 years depending on the vaccine type and your vet's protocol. Annual health checks are valuable even when not every component is boosted every year.