As you may see in the thread I posted, I just brought an FIV+ cat into my home of 5 FIV- cats. I had to bring him in - long story. I had read and heard conflicting things about this issue. People who posted about their experiences with having both FIV negative and positive cats helped. My vet said it's transmittable only through serious bite wounds. This site has a list of myths about the disease: http://www.langefoundation.com/index/FIV_Cats.html