Marigold, just to let you know. Maddy would test positive for FIV (feline HIV) if she was ever vaccinated for it. It is not like Felv (feline leukemia) where if they are vaccinated they will show negative for the disease if tested. Once a cat has been vaccinated for FIV they will always test positive for the disease even if they don't have it. Even so FIV+ and FIV- cats can live together without problems of transmitting to the other. Jenny has FIV+ cats that live with FIV- cats and all is well.