Oh that is fabulous news about being FeLV negative - AND the appt on Monday for his neuter and vaccinations!
!
The FIV... Unless you live in TX, MS, LA or maybe FL or AL, there is absolutely NO point in getting your other cat vaccinated against FIV. Is it turns out, there are different strains of FIV, and the vaccination is ONLY effective against a strain in the SE. It's only effective approximately 70% of the time even then... so there's just not much point. Yes, there ARE documented cases where indoor-only kitties have gotten FIV from a housemate, and they don't know how it happened, because the owner was not aware of a deep penetrating bite wound on the kitty that became infected. But it's rare. And FIV is just not a death sentence anyway. It is SUCH a long-acting virus, it just VERY slowly impacts the normal functioning of the immune system.
If you want to know FOR SURE that you don't have a false positive (which definitely happens), the next step is a test called a Western Blot. It tests for two specific antibodies, and if those both turn up, then there is no doubt. There are no false positives with the Western Blot. I don't know how much it costs where you live, but it costs about $165 here. So if you need to know for sure, do it. If you don't need to know for sure, you can just assume he is.
The only way it would affect your care... as Ms. Freya pointed out - if you ever notice he's off his food or a little lethargic - any behavior changes - ANYTHING that might indicate he's sick, you get him to the vet. Illness just needs to be caught early, and often treated more aggressively. So, for instance, instead of treating something with Clavamox, they'd probably use Baytril. And instead of being on an antibiotic for 10 days, he may need to be on it for 2 weeks, or 20 days. That kind of thing.
Kitties with FIV are prone to problems with their teeth and gingivits.
So if you can afford it, it's really best to get him in for a dental cleaning and check up every six months, instead of every year. But you really ought to do it every year at a minimum.
Since you've already done your reading up on it, I will offer just one link. This is the BEST resource there is on FIV:
http://www.fivtherapy.com
Now... when we rescued Chumley, he was a mess. He had chronic diarrhea, he appeared to be allergic to food - what, we didn't know. Allergies in cats are usually first treated with steroids - but this is contraindicated in cats with FIV, as steroids work to suppress the immune system, and that's the last thing an FIV kitty needs.
So when our usual vets (one of whom is AMAZING) were unable to get his diarrhea under control, and his allergy problem was getting worse, not better, even though we'd switched him to the hypoallergenic prescription food, we decided to look for a vet (a D.V.M.) that was also trained in alternative therapies. You'll see if you go through the
http://www.fivtherapy.com site that the 2nd treatment they gave Bud was all herbal based. We printed out the entire site and brought it with us to the appointment.
She didn't need to look through it. She knows western meds like any vet, but she wanted to pursue treating him based on Chinese medicine. She has treated FIV kitties before, and they have subsequently tested NEGATIVE for FIV. So rather than try to pursue Bud's specific therapy, we let her do her thing. The drops she prescribed for his diarrhea worked inside of four days. It took a couple of weeks for his stool to become completely normal, but that was impressive. He was SO itchy, he'd licked his abdomen clean of hair. Turns out that while that MAY have been a food allergy... (and we had switched him to a grain free, all wet food diet), she diagnosed him with "an extreme spleen Qi deficiency," and "an extreme Yin deficiency." Basically... he was "too hot" (not in a fever sense, in an energy sense), and thus he was pulling out his hair. She prescribed a chinese herbal pill. Within two weeks, it was clear it was helping. We bumped up how much we were giving him... and his "itchies" and over grooming stopped. It takes a while for all the hair on the abdomen to grow back in, but his coat is now thick, full, and incredibly soft and glossy.
And no more itchies! Oh - we did have to switch to an unscented dust free litter, and that's something to consider up front.
But as it turns out, a number of the herbs in the pill we're giving him are part of Bud's herbal protocol.
We do plan on retesting Chumley at some point, just because we're curious to see if he'll test negative.
So I don't know where you live. But I give your vet big points for being pretty FIV literate! For all I know, you live in the SE, and then it wouldn't hurt to consider vaccinating your other kitty. But if you make slow introductions, there shouldn't be a problem with fighting, which is all you really need to worry about. Our Billy and Chumley are our two VERY cat friendly cats, and they groom each other all day long... and we don't give it a second thought. FIV is not passed orally via saliva.
But if you have ANY questions, feel free to ask me!
And if you find that Mr. Jinx develops any kind of immune-related issue (such as something that may be caused by an allergy, or IBD, food sensitivities or whatever), I HIGHLY recommend you do some searching to see if there's a DVM that is additionally trained in western herbs or chinese medicine that you can get to without too much problem. We've worked with this vet for over a year now, and I'm convinced that western medicine saves a LOT of lives, no doubt about it - but it does not treat immune-related problems nearly as well as chinese medicine does.
P.S. Chumley is the kitty in my avatar next to my username.
!!! 
Poor Mr. Jinx and those sore cheeks and missing teeth- but all will be well now, he has you 
to help him heal. We are here to help you along the way with anything 
. Will be waiting to hear the good news 
I, too, hope the news is better than the vet led you to hope. 
YAY YAY That is fantastic news!! For the FIV - you will have much support here on that and positive resources from Laurie (above 
And what a survivor he is! 
I'm taking it pretty hard.
It can take a couple of days to clear their systems. 
