A guide to kitten vaccinations

Welcoming a new kitten into your home is exciting – and vaccinations are one of the first important steps in keeping them healthy. If you’re new to kitten care, it’s completely normal to have questions about which injections are needed, when they should be given, and when it’s finally safe for your kitten to explore the outside world.

FirstVet vet Dr Jessica May explains why vaccinating your kitten matters, what the UK vaccination schedule looks like, and how to give your curious cat the best possible start in life.

Table of contents

• Why vaccinating your kitten is essential
• Which vaccinations do kittens need in the UK?
• How many injections will my kitten need?
• How much do kitten vaccinations cost?
• When is it safe for kittens to go outside?
• Common questions about kitten vaccinations

Why vaccinating your kitten is essential

Vaccinating your kitten is one of the most effective ways to protect them from serious and potentially life-threatening diseases. Young kittens have developing immune systems, which makes them particularly vulnerable to infections such as feline immunodeficiency virus (FIV) and other viral illnesses.

Vaccinations don’t just protect your own kitten – they also help reduce the spread of disease to other cats. Once your kitten has completed their initial vaccination course, vets recommend continuing with regular booster injections throughout adulthood and into later life.

It’s also worth checking your pet insurance policy carefully. Many insurers will not cover illnesses that could have been prevented by routine vaccinations.

Can unvaccinated kittens mix with vaccinated cats?

In some cases, an unvaccinated kitten may be around a healthy, fully vaccinated adult cat. However, most vets advise caution. Until your kitten has completed their primary vaccinations and allowed time for immunity to develop, it’s usually best to keep them indoors and away from unfamiliar cats.

Because kittens are still growing and building their immune defences, they’re at a higher risk of becoming unwell. Contact with unvaccinated kittens or outdoor cats should be avoided until your vet confirms it’s safe.

Which vaccinations do kittens need in the UK?

In the UK, kittens are routinely vaccinated against cat flu and feline parvovirus. If your cat is likely to go outdoors or come into contact with other cats, vaccination against feline leukaemia virus is also strongly recommended.

If you live outside the UK, vaccination requirements may differ, so always check local guidelines.

Cat flu (feline influenza)

Cat flu is a highly contagious respiratory illness that can be particularly severe in kittens.

• It spreads through saliva, nasal discharge and contaminated objects such as bowls or bedding.
• Symptoms may include sneezing, runny nose, fever, coughing and watery eyes.
• Some kittens may also develop mouth ulcers, eye ulcers, lethargy and reduced appetite.
• Cats can become long-term carriers and experience flare-ups throughout their lives.
• Vaccination won’t always prevent infection entirely, but can reduce severity and frequency of symptoms.

Feline parvovirus (FPV, feline enteritis or panleukopenia)

Feline parvovirus is a serious and often fatal disease, similar to parvovirus in dogs. It attacks the immune system and the lining of the intestines, and in some cases affects the heart.

• The virus spreads through contact with infected cats, their faeces or contaminated environments.
• Pregnant cats can pass the virus to their unborn kittens, sometimes resulting in cerebellar hypoplasia.
• Symptoms include fever, lethargy, vomiting, diarrhoea and loss of appetite.
• Kittens infected before birth may show coordination, movement or vision problems.

Feline leukaemia virus (FeLV)

Feline leukaemia virus is another serious condition that weakens the immune system and increases susceptibility to other infections.

• It can also lead to cancers such as leukaemia and lymphoma.
• The virus is spread through bodily fluids including saliva, urine and faeces.
• Signs may include weight loss, lethargy, fever, vomiting, diarrhoea, anaemia and poor appetite.
• There is no cure for FeLV, making vaccination a key preventive measure.

Additional vaccinations

If you plan to travel abroad with your cat, a rabies vaccination is legally required, along with regular boosters. Rabies is a fatal disease transmitted through saliva and can cause neurological symptoms such as seizures, paralysis, and behavioural changes.

Some kittens may also be vaccinated against feline chlamydia, a bacterial infection spread through close contact with infected cats. Symptoms are similar to cat flu and include conjunctivitis, sneezing, fever and eye discharge.

How many injections will my kitten need?

Kittens require a primary vaccination course to build proper immunity. This usually consists of two injections, though in some situations a third dose may be advised depending on risk factors.

When should vaccinations start?

The first vaccination is typically given from around nine weeks of age. The second injection is usually administered two to four weeks later.

How often are booster vaccinations needed?

After the initial course, most cats need booster vaccinations every year to maintain protection. Some vaccines may only need boosting every few years, and your vet will advise you based on your cat’s lifestyle and health.

How much do kitten vaccinations cost in the UK?

The cost of kitten vaccinations varies between veterinary practices, so it’s best to contact your local clinic for exact pricing. As a guide, the primary vaccination course in the UK can cost anywhere between £70-£120, while annual boosters are about £40-£80, though this can vary by location.

Many practices also offer healthcare plans, which allow you to spread the cost through monthly payments. These plans often include vaccinations, annual health checks and parasite treatments.

When is it safe for kittens to go outside?

their primary vaccination course. Until then, they should remain indoors, even if they’re desperate to explore.

Animal welfare charities such as Blue Cross recommend waiting until a kitten is around five months old before allowing outdoor access, as they’re then closer to full physical development.

It’s also important to remember that microchipping is now compulsory in the UK. Having your kitten microchipped means they can be identified and reunited with you if they wander off.

Can kittens go into the garden before vaccinations?

Because kittens are excellent climbers and escape artists, it’s usually safest to wait until they’re fully vaccinated before letting them into the garden. Even enclosed spaces can pose a risk if your kitten manages to get out.

Find out how to create a cat-friendly garden.

My kitten went outside before being vaccinated

If your kitten has been outdoors before completing their vaccinations, there’s a risk they could have been exposed to infection. Contact your vet for advice – they may recommend a health check or monitoring for symptoms.

My kitten missed their second vaccination

If your kitten is late for their second injection, book a vet appointment as soon as possible. Depending on how long it’s been, your vet may still be able to continue the course or may advise restarting it to ensure full protection.

Common questions about kitten vaccinations

Are there side effects from kitten vaccinations?

Most kittens tolerate vaccinations very well. Mild side effects can occur and usually resolve within 24-48 hours. These may include tiredness, reduced appetite, sneezing or a slight fever.

Serious reactions are extremely rare. If you’re worried about any symptoms following vaccination, contact your vet for reassurance.

Can I vaccinate my kitten at home?

Vaccinations should be given by a qualified veterinary professional to ensure they’re administered safely and correctly. Home vaccinations are only carried out in specific circumstances and under veterinary guidance.

How else can I protect my kitten’s health?

During vaccination visits, your vet will often discuss other essential aspects of kitten care, including:

• Microchipping, which is a legal requirement in the UK (must be done before cats reach 20 weeks)
• Nutrition, including choosing a balanced diet and switching foods safely
• Worming, typically every two weeks until 16 weeks of age, then every one to three months
• Flea control, with options such as spot-ons, tablets, injections or collars

We all want the best for our kittens. That’s why we offer lifetime kitten insurance, helping to protect their health now and in the years ahead.