It's important to know that some feline vaccines have been associated with tumor formation in one in 10,000 cats, writes veterinarian Karri Miller. Veterinarians inject vaccines in specific locations to make treatment easier should a tumor arise, and task forces have developed ways to minimize the risk from the vaccines. Vaccination is still in cats' best interest because the risk from deadly disease can be greater than the risk of developing a tumor, Dr. Miller writes.

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