Nina, I don't want to give you any false hope.  It is more likely that an adult 
cat will throw off the virus than a kitten.  There is always a chance the test 
result was an error.  

Do you know what became of Sally's littermates.  My experience with kittens is 
that all in the litter tested positive at 4 weeks of age and remained positive. 
 The Momma cat was also positive.  It's great that you have a home lined up for 
Sally if she remains positive.  My four positive babies were adorable and I 
loved every day I had with them.
--- On Fri, 10/1/10, <> wrote:

> From: <>
> Subject: [Felvtalk] Immunity to Felv once exposed then test neg?
> To:
> Date: Friday, October 1, 2010, 1:54 PM
>  Hello All,
> This question is for a foster kitten I know of that tested
> felv+.  Her name is Sally and she is only 6 weeks
> old.  Happily the rescue that Sally is with knows
> enough to test again and Sally is being fostered in the
> meantime.  I'm wondering this, if Sally has tested pos
> once, (assuming it was a true pos), then that means she has
> been exposed to the disease.  If she later tests neg,
> does that mean she would be "immune" to felv in the same way
> she would had she been vaccinated against it?  The
> reason I ask is Sally has a potential adopter waiting for
> her based on her next test result.  This woman already
> has an felv+ kitty.
> I'm wondering if there have been any studies done
> indicating a cat previously testing pos, then throwing the
> virus and testing neg, is less susceptible to contracting
> felv when exposed to known positive cats.
> Nina
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