Cat Vaccinations

A ginger cat with fluffy fur and wide eyes being gently held by a veterinarian wearing green scrubs in a clinical setting.

The first evidence that properly manufactured feline enteritis vaccine offers longer than one year immunity was published in the early 1990s and since that time we have had a policy at the London Veterinary Clinic of giving boosters less frequently than yearly.

Today, we vaccinate and give booster inoculations according to an individual’s life style. These are our general guidelines.

Why Vaccinations Matter

Preventing disease through inoculation is a technique that harnesses the body’s natural ability to fight infection. An infectious agent such as a virus or bacteria is modified so that it is no longer infectious but is still similar enough to its unmodified infectious form that when the immune system is exposed to it, the immune system creates antibodies, proteins that attach to and help destroy the specific infectious agent.

Vaccines are creating either by killing infectious agents, modifying them so they are still alive but no longer infectious or by taking vital components of them and, through genetic engineering, enslaving bacteria to produce replicas of these parts. Kittens acquire protective antibodies from the milk they suckle from their mothers soon after birth. These temporary antibodies usually last around six to 12 weeks.

Vaccinating Indoor & Outdoor Cats

We vaccinate all indoor and outdoor kittens against feline infectious enteritis and two forms of cat flu, feline herpesvirus-1 (FHV-1) and feline calicivirus (FCV), with two inoculations given three weeks apart, starting as early as eight weeks of age.

We follow the suggestions of The American Association of Feline Practitioners and the American Academy of Feline Medicine and give a booster at fifteen months of age and then no more frequently than every three years for feline infectious enteritis, and in general every three years for FCV and FHV-

Boarding catteries usually require proof of vaccination within the preceding 12 months.

Outdoor cats that meet feral cats are vaccinated against leukemia virus (FeLV) as kittens and again at fifteen months of age. As cats age, the frequency of booster inoculations against FeLV diminishes until in most instances it can safely stop.

Cats traveling under the Pet Travel Scheme are vaccinated against rabies with a three year vaccine. For more information, please go to “Travelling abroad with your pet” in NEWS AND ADVICE

Indoors or Outdoors?

Most cats we see live indoors but if you have a garden decide when you get your cat whether to let it roam outdoors. The indoor versus outdoor debate has no conclusive answer but there is no denying that outdoor cats, especially in the heart of London, live much shorter lives than indoor ones, not just because of the greater risk of fatal injuries but also because of the array of potentially lethal viruses cats come in contact with when they meet and fight with cats that carry these viruses.

Infections from two of these viruses damage the immune system and predispose to the development of lymphoma, the most common tumour cats have. Outdoor risks from transmissible diseases are dramatically reduced through vaccination.

Feline Infectious Enteritis

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This virus causes severe vomiting and diarrhoea, even death especially in kittens. It can survive for prolonged periods in the environment.

Cat ‘flu

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Feline herpesvirus (FHV-1) and calicivirus (FCV) cause most cat flu and spread through close contact. Signs include sneezing, eye and nasal discharge, mouth ulcers, sore throat and coughing; severe cases may lead to pneumonia or lasting eye and nose damage. Most cats recover, though it can take weeks; vaccination reduces severity but does not prevent infection or carrier status.

Feline Leukaemia Virus

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Feline leukemia virus (FeLV) spreads through saliva during prolonged close contact between cats. It often causes lifelong infection, and many affected cats die within three years from related diseases such as lymphoma or anaemia. Blood testing has helped reduce FeLV, especially in breeding cats. Vaccination protects many at-risk cats but does not guarantee complete immunity.

Vaccine Side Effects

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Mild reactions such as pain at the injection site or a low fever for a day are neither unusual nor worrying but more severe adverse reactions to inoculations do sometimes occur. In the largest UK published survey suspected adverse reactions occur in one out of every 15,000 inoculations, usually in cats under six months old. The most common adverse reactions were lameness, temporary injection site reactions and general allergic reactions.

Are Homeopathic Vaccine Effective?

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It would be wonderful if homeopathic protection against transmissible infection worked but challenge studies show that it doesn’t. If you believe in homeopathic nosode treatment, by all means provide it for your cat, but don’t deny it the true protection of primary inoculations.

Injection Site Sarcomas

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Injection-site sarcomas are rare but serious tumours in cats, thought to be linked mainly to genetic susceptibility rather than vaccines alone. They can develop after any injection or inflammatory injury, including vaccines or antibiotics, and risk is very low with no difference between vaccine brands. Cats that repeatedly show swelling, heat, or pain after injections should avoid unnecessary injections where possible.