Toby is 7 and Tiger Lily is 1. Many thanks for your reply. The biggest risk associated with vaccination with feline leukemia virus is a potential increase in the liklihood of fibrosarcoma, a form of cancer, at the injection site. While there is still some debate about the link between vaccination and formation of this cancer I tend to think we should be cautious in use of vaccinations until the issue is sorted out. These risks have to be weighed against the risks of not vaccinating for this disease.
Feline leukemia is transmitted by direct contact with another cat.
It is not an airborne infection and the virus can only live outside the cat's body for a very short time, literally seconds. Therefore, an indoor cat has very little chance of being exposed to the virus. Sometimes an indoor cat escapes from home. Unvaccinated and without natural exposure experience, this cat would be more susceptible to getting feline leukemia if it did have contact with an infected cat. I can't think of a good excuse for a cat in my hospital to be exposed to this virus during its stay.