Sorry, this thread often goes off topic and most of us haven't minded at all. I think we needed some lighter stuff to talk about today. YMMV.
I've been in this business for over 25 years, and it's not our choice, from experience. It is certainly not a myth as you stated, This site you sent says:
'FIV is transferred only by saliva to blood or blood to blood contact. What that means is sharing a litter box, food bowl, minor scuffles or grooming each other, does not pass FIV from one cat to another. A significant puncture wound or multiple wounds would have to occur for an infected cat to transfer FIV to an uninfected cat. This type of fight is pretty rare--almost unheard of-- amongst spay/neutered cats living in a home or kennel environment."
What they say is correct..however, these are kittens, and play is their middle name. They do bite and get in more than minor scuffles. a significant puncture wound is in the eye of the beholder, and why take a chance? We've had other kittens test positive and not a sign of a mark on them. I have never heard a vet say that it's just fine for them to cohabitate, and that is not the choice when this has been discussed at many seminars I have attended. but obviously you have a vet willing to take a chance. You are taking a chance however..and it's not one we want to risk. If someone is kind enough to adopt these babies and give them a forever home, we want to do our best to make sure they don't infect a cat in the home they are going too. Most FIV cats do well for a half dozen years..much, much longer as long as they stay healthy. This is not our groups first batch..and we've done a lot of studying on it. We are one of the few groups in the area that does not put them down when they test positive.
That said, as we certainly see in this thread, you can find anything you want on the net..to support opinions both ways. However, we like to (and will continue to) err on the side of caution, and between the four of us that have vet/vet tech experience in our group, we bring over 100 years of experience, not counting all the others who have various amount of experience. Most rescue groups will not place a FIV positive cat with another cat..we simply won't take the chance.
I won't argue back and forth this with you, because this isn't the place, but you'll have to trust we truly do the best for our cats and our future adopters. And for us, that includes not adopting out FIV positives cats to someone with another cat in the home.