I haven't had a chance to check out this link so it may cover everything I say 
but I wanted to share what I've learned about FeLV just in case it didn't cover 
everything.  I've read a lot of websites, books and talked with several vets 
about all this.  My understanding is very rudimentary but here's what I've read:
If a cat test positive on the IFA test then it has FeLV and is shedding the 
virus in the saliva and blood.  This test looks for the virus in the white 
blood cells so once the virus has gotten that far it means the immune system 
wasn't able to extinguish the virus and almost 100 percent chance the cat will 
always be positive and shedding the virus and can infect other cats.  No need 
to do any further testing.
At this point, if the IFA test is negative it can mean a couple of different 
things.  1) It can mean the ELISA test done in the vet's office was just plain 
wrong.  It's a sensitive test and can easily produce false positives.  It 
should never be solely relied upon as a diagnosis for FeLV.  2) A negative IFA 
test could also mean that the cat really has gotten the virus, which means the 
ELISA test was correct, but the virus hasn't reached the white blood cells.  If 
this is the case, the cat still has a chance for the immune system to either 
extinguish the virus or put it into latentcy.  From what I've read about 40% of 
these cats will extinguish the virus or put it into latentcy.  But since all 
cats don't extinguish the virus if this first IFA test shows negative, to be 
certain the IFA test should be repeated a few months later. 
If the cat has actually put the virus into latentcy it means the virus is in 
the bone marrow but isn't being shed so it is not infective to other cats.  
However, the virus can be brought out of latentcy even years later if the cat 
becomes ill or has some other major stressors.  But many cats who do initially 
put the virus into latentcy will later on extinguish the virus so you just 
never know.  The vet book I just read said that the only way to find out if a 
cat has the virus in the bone marrow, meaning it's dormant/latent, is to do a 
biopsy of the bone marrow.  That means that there really may be lots of cats 
out there that have contracted FeLV but put it into latentcy and the owner 
never even knows.  The books said only about 10% of exposed cats will put it 
into latentcy though.  So most will either extinguish the virus or become 
carriers (persistently viremic).
So I believe the woman who told you that a negative IFA test still means the 
cat has FeLV is wrong and myself I wouldn't put her in with positive cats until 
you know her true status.  Or, at least get Poppy vaccinated before putting her 
in there with positive cats.
It does take continued and prolonged exposure for a cat to get the FeLV virus 
into it's system.  Cats who eat after each other only on rare occasions are not 
likely to spread the virus.  My thoughts are that if Poppy is in a cat condo 
and occasionally hisses at another cat it's not likely that would be enough 
exposure for the negative cat to get it.  Especially if the negative is a 
healthy adult cat.  That's not a guarantee though so you have to decide for 
yourself about that one. 
The vaccination has become much more effective.  Seems like I read somewhere 
that it was 90%.  I have a friend who has had several FeLV positive cats living 
with negatives and even a couple FIV positive cats, for many years.   She has 
way more cats than you.  All the FeLV negative cats, including the FIV positive 
cats, get FeLV vaccinations every year and have never gotten FeLV.  They all 
live together, share food and water bowls, etc.  She's not the only one with 
these kinds of results with a house where positive and negatives hangout 
Can't think of anything else right now.  It's very confusing though.  I have 
more cats than you and in March a two year old died and we found out she had 
FeLV even though she tested negative as a kitten.  I'm going through the 
process of re-testing all the other cats right now.  I've only gotten 5 tested 
so far but all 5 have been negative, thank the Lord.  Four out of those five 
lived with the FeLV positive cat for one or two years, have never been 
vaccinated and still didn't pick up the virus, or were able to extinguish it.  
Good luck making the decision.  It's tough.  It's a fatal virus and you can't 
play with it but at the same time there's so much misinformation out there and 
a lot of unecessary pre-cautions or euthanizations are taking place.

“I am not interested to know whether vivisection produces results that are 
profitable to the human race or doesn’t….the pain which it inflicts upon 
unconsenting animals is the basis of my enmity toward it, and it is to me 
sufficient justification of the enmity without looking further.” – Mark Twain

> From:
> To:
> Date: Fri, 15 Apr 2011 13:59:38 -0500
> Subject: Re: [Felvtalk] Question re positives & negatives
> Pam,
> I've done a lot of research myself and I asked my vet many questions. Here 
> is a link that was very helpful to me and I had my vet review this in case 
> she had a difference of opinion. This is very accurate information. I think 
> it will answer many of your questions. Here is the link:
> I will say that it's not worth the risk getting your other cats infected to 
> socialize Poppy. She will be fine confined, just give her as much attention 
> as possible at least until she has been cleared of the virus (meaning she is 
> not permanently positive for leukemia).
> Also, I am in the same boat as you. My kitten (Crash) that I fostered, then 
> adopted turned out to be FeLV negative this past Nov. 2010. On March 10, 
> 2011 he had to be put down because he was in very bad shape. He was anemic, 
> had a hear murmur and his oxygen level was next to nothing. He was fine 2 
> days prior. I actually took him in because he did not have a bowel movement 
> in 2 days (we were treating him for diarrhea) and I just thought his new 
> food was working well. Now my Ragdoll cat is at risk because I did not get 
> him vaccinated against leukemia because he is strictly and indoor cat. So 
> far, he has been negative but will test again on May 9th. I so want to get 
> him another companion. It keeps him active and it's such a joy to watch to 
> kitties play. Had I known that Crash was contagious with leukemia, I would 
> have never exposed my other cat. This disease is fatal, with no cure. But I 
> will say that the vaccine is not 100% (but none of them are) effective at 
> all times, but it's better than not being protected at all.
> I hope that Poppy's immune system clears the virus. You may also get her 
> siblings tested again to be safe and the mother as well.
> Good luck! I hope this info helps!!
> Lynda
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