In general, kittens shouldn’t be vaccinated before the age of six weeks. Likewise, geriatric cats (over 10 years old) may be better off without receiving additional booster shots, to avoid putting stress on their immune systems. Your vet may also advise against vaccinations if your cat has a chronic illness or a compromised immune system (for example, due to cortisone therapy).
Booster shots for older cats - The Washington Post
In the US, states have their own laws regarding the administration of rabies shots in cats. Some states require yearly rabies vaccination. Others, like Texas, have a three-year rabies vaccination law.
Feline Leukemia Shots - Cats - LoveToKnow
Vaccines work to help your cat's immune system ward off specific illnesses and diseases. Having your cat properly vaccinated is a vital step to take for pet health and happiness. As your cat ages, he or she will need certain booster shots to maintain protection. Vaccines are categorized as either core vaccines or non-core vaccines.
What Shots Do Unvaccinated Cats and Older Kittens Need? - Catster
How often do your cats get the distemper/FVRCP shots? I know there are 1 year and 3 year variations. I hate giving Mimosa the distemper shot every year because she seems to be more sluggish and grumpy after each time but my vet says they don’t recommend the three year because it may be linked with a greater risk of cancer at the site and she says (in her opinion) it hasn’t been around long enough for it to be properly tested, so Mimosa has gotten one ever year so far. She is an indoor cat. I hate people who over-vaccinate but I also am one of those people who like to take pets for yearly and consistent check ups to make sure they are healthy. I’m always so torn when its time to go to the vet! I think I’m more stressed than Mimosa.This question is a very good one. And it touches upon the ultimate unanswered million-dollar question of veterinary medicine: How often do cats need shots?