Cats should be vaccinated to protect them from cat flu and feline enteritis, and also against Feline Leukemia virus.
Kittens need a course of 2 injections, given 3 weeks apart. The first should be given at 9 weeks of age.
You should allow at least 1 week after the second injection, before your kitten can go outside.
Yearly booster vaccinations should be given to maintain your cat's immunity.
Booster vacciations are required if you wish to put your cat into a cattery while you're away.