Re: [Felvtalk] Do you know why....

2010-04-20 Thread Heather
I've had kittens go from negative to positive, and positive to negative.
Also had a double+ adult turn out to be only FIV+.His initial snap was
said to be a light positive and I know that term is highly debatable, but
for the record, he did not have a strong blue dot on the first test, but a
faint one.  He was held for a couple of months, retested on IFA  then snap
and was only FIV+.

The kittens who went negative to positive were from a double positive
Momall kittens cleared the FIV, 2 were only FIV+ when tested (and taken
from Mom) at 6 weeks of age, but all turned out to be FELV+.  Mom outlived
them all.

We also had 2 kittens (separate situations, not same litter) who had again
that debatable light positive on snap tests and were held  retested and
were negative, confirmed via snaps  IFA.

On Mon, Apr 19, 2010 at 11:56 AM, Lorrie felineres...@kvinet.com wrote:

 On 04-18, Reyna Castano wrote:

  If a cat tests negative for feline leukemia why does the vet
  recommend a second test in two months?  What are the possibilities
  of the same cat testing positive the second time?

  Reyna

 Because if a cat was exposed to FelV it takes about 6 weeks for the
 virus to show up.  So the first test may not be accurate as the virus
 didn't show up yet.


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Re: [Felvtalk] Do you know why....

2010-04-19 Thread Beth Noren
Not sure statistically how often it happens, but I know it can,
because it happened to me.
Tested mom cat (negative) and sickly 7 week old runt (positive) with
the in-house Elisa snap test.
Four other littermates were separated from mom and the runt and were
tested at 8 weeks (all negative).  At 14 weeks one of the negatives
came down with a fever, we ran the Elisa test again and he was
positive.  He apparently was very recently infected when we tested him
the first time, and thus didn't yet have enough of the antibodies? or
is it antigens? circulating in his blood stream for the test to
detect.  It is important to retest cats that test positive as well, as
they may fight off the disease and test negative at a later date.  In
order to give the virus time to clear out or settle in, you should
wait at least 120 days from last exposure to test again.  And, it is
best to use the IFA test the second time.  I understand it is better
at picking up persistent infection which has settled in the bone
marrow.  I suspect that had we IFA tested the feral momma kitty, we
may have found that she actually was infected.  Instead, when we got
that first negative we had her spayed and released.  Of course, their
is also a chance that she really was negative, the kittens could have
been infected by another stray...

Beth

On Mon, Apr 19, 2010 at 12:55 AM, Reyna Castano rcpin...@yahoo.com wrote:
 If a cat tests negative for feline leukemia why does the vet recommend a 
 second test in two months?
 What are the possibilities of the same cat testing positive the second time?

 Reyna






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Re: [Felvtalk] Do you know why....

2010-04-19 Thread Lorrie
On 04-18, Reyna Castano wrote:

 If a cat tests negative for feline leukemia why does the vet
 recommend a second test in two months?  What are the possibilities
 of the same cat testing positive the second time?

 Reyna

Because if a cat was exposed to FelV it takes about 6 weeks for the
virus to show up.  So the first test may not be accurate as the virus
didn't show up yet.


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