That's what we're wondering - whether the virus is shed into their saliva while 
their immune system is still fighting the virus.  If the ELISA is positive but 
the IFA is still negative are the cats able to infect another cat.  My book 
said that when the IFA is positive the cats are able to infect other cats.  It 
didn't say that about when the ELISA is positive but the IFA is negative.  It 
didn't say anything at all about that situation so we're wondering at what 
point in the progression of the disease is the cat able to infect another cat.  
Since the ELISA test can use saliva or blood to detect the virus then that 
means the virus is in the saliva at that point right, and I would think it 
would be able to infect another cat.  But that may not be correct.  Maybe the 
virus can't be spread until it's progressed all the way through the body and 
has gone into the white blood cells.  Maybe once the virus goes into the bone 
marrow and white blood cells it changes or mutates into a way that makes it 
contagious.  I don't know, it's weird.  I guess if the experts don't know then 
I'll never figure it out either.

“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

> Date: Wed, 3 Aug 2011 10:10:37 -0400
> From:
> To:
> Subject: Re: [Felvtalk] doubts on two FeLV positive kitties
> So, does that mean that as positive kittens'/cats' virus is being fought by
> their immune systems, they are contagious?  I have heard vets use the term
> "shedding" in this context since the 90s, NOT meaning that they are
> infectious during that time.
> What a little word can mean.....
> -----Original Message-----
> From:
> [] On Behalf Of Beth
> Sent: Wednesday, August 03, 2011 9:50 AM
> To:
> Subject: Re: [Felvtalk] doubts on two FeLV positive kitties
> Shedding a virus means they are contagious.
> Beth  
>  Don't Litter, Fix Your Critter!
> ________________________________
> From: Natalie <>
> To:
> Sent: Wednesday, August 3, 2011 9:19 AM
> Subject: Re: [Felvtalk] doubts on two FeLV positive kitties
> Are we talking about two kinds of shedding of the virus?
> When I say shedding the virus, I mean that as the immune system develops,
> the body gets rid of the virus.
> Could it also mean that as the virus infects while shedding?
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