I think if certain circumstances were okay it might be a less of a risk than
what you've been told, i.e., the cats involved are very mellow and unlikely
to fight because I've heard it's transmitted from deep puncture wounds. I
am, however, not an expert and could be wrong about this.  Probably the
people who do a lot of cat rescuing would know.  I do know my vet wouldn't
have condoned doing it. I think if I couldn't have found a home for Pirate
we would've tried to work out something for him to be with us.  I've also
been told that FIV+ cats are generally very sweet (probably why they got
beat up in cat fights).

Christine

My jack became FLV + from just associating with cats.   I know, it happened
while I was fostering.  I was told the kittens were negative, but were in
fact positive.  I had the rest of my brood vaccinated, knowing that the
vaccine wasn't 100%.  I didn't care, I couldn't part with any of them.  I
had him retested in 6 weeks and he was still positive.

I started supplementing my brood with vitamin C.  a year later he is not
only flv- but also fip - (long story)  I can't recommend highly enough
giving vitamin c !

I do, Mary. I didn't really have a choice. Both negative cats are
vaccinated; Bonnie is due for her booster next month. I hate the idea of it
but again, there were no choices.