Vaccine: Herpesvirus (FHV) and Calicivirus (FCV)
Why It’s Important: These vaccines are often combined with the vaccine for FPV. They protect against viruses that cause respiratory infection in cats.
When Your Cat Needs It: This schedule is the same as the FPV vaccine: 6 to 8 weeks old, then every 3 to 4 weeks until 16 weeks of age. After that, get a booster after one year and then every three years.
Why It’s Important: This is one vaccine you can’t skip; state and local laws will require your cat to be vaccinated.
When Your Cat Needs It: It depends. If your cat receives the recombinant vaccine, it should be given at 8 to 12 weeks with a booster should be administered annually. If your cat receives the killed virus vaccine, it should be given at 8 to 12 weeks with a booster at one year and then every three years. Make sure to check with your vet to see which vaccine your cat is receiving.
Vaccine: Feline Leukemia Virus (FeLV)
Why It’s Important: Although this is not considered a “core” vaccine, it’s a good idea to think about getting it, since FeLV is the second-leading cause of death in cats (after trauma). It’s especially important if your cat spends time outdoors or with other cats.
When Your Cat Needs It: Get it when they’re 8 to 12 weeks, then again at 14 or 16 weeks. After that, get a booster annually.
Pets.WebMD.com. Core Vaccinations for Cats.
Pets.WebMD.com. Noncore Vaccinations for Cats.