FIV is not related to the human virus HIV, although many of the symptoms may be similar. FIV infection is restricted solely to cats. The method of transfer is believed to be through bite wounds rather than casual contact. As the immune system becomes affected, the cat is likely to contract secondary infections. It is these secondary infections that are responsible for most of the clinical signs associated with FIV infection.
Treatments used are to combat the secondary infections that arise.
No vaccine is currently available. Protection can be assured only by preventing your cat from contacting infected cats. Cats kept indoors and away from free-ranging cats are highly unlikely to contract FIV infection.