How often do cats need the feline leukimia shot?

Answers:
Once a year.

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the first year they need a booster 3 weeks from the first one. After that it is a yearly vaccination

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Before getting the vaccine they need to be tested first. If the test is negative, they will get the vaccine followed by a booster 3 weeks later. From thereafter, it is an annual vaccine. Only outdoor cats need this vaccine. EXCEPTION: If you have multiple cats and one goes out and the others do not, the indoor cats will then also need it.

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The feline leukemia vaccine is not considered a core vaccine, so it's not "required". If your cat goes outside, than it may be necessary. My cat's are indoor only, so I don't give it.

There is some research that indicates adult cats have a natural immunity to leukemia. There is also a higher rate of injection site carcinoma - tumors where the vaccine was given - with that particular vaccine. That's why the injection is given in the leg. In the case that it ends up with a cancerous tumor, the leg can than be amputated to save the cat's life.

It's best when all vaccines in general are given every few years. Current research indicates that vaccines are providing longer and longer immunity to diseases, and yearly vaccines are causing more harm than good. Rabies and distemper are now available in 3 year injections.

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Jenn's first two paragraphs were right on the money. However, Feline Leukemia vaccines must still be given every year in order to maintain immunity. Unlike core vaccines, they have not been shown to be effective long term. Also, Feline Leukemia vaccines do not cause your cat to test positive for Feline Leukemia; I think Jenn confused them with FIV vaccines, which do result in false positives.