The Feline Leukemia Vaccine is designed to protect cats from the Feline Leukemia Virus (FeLV), a serious viral infection that can lead to various health issues, including cancer and immune system problems. The vaccine is typically recommended for kittens and cats at risk of exposure, such as those that go outdoors or live with other infected cats. Vaccination involves an initial shot followed by a booster, ensuring the cat develops adequate immunity. While the vaccine significantly reduces the risk of infection, it is not 100% effective, so regular veterinary check-ups and preventive care are essential for maintaining a cat's health.