Quote Originally Posted by jenn_librarian View Post
I know that you can have false positives, but you can't have a false negative. I was told that by a vet. If the antibodies are there, they will test + for either disease.

I don't know how many false positives there are, but I think many times they test positive when they have been exposed for a period of time, have been bitten (most adults testing positive are stray males) or are born with it. Most of the cats I know that have tested positive STAYED positive. I've only known of a few FIV+ cats that actually tested negative later on (they had basically contracted the antibodies from their mother, and the body fought it off).

Both my vets wouldnt test for Leukemia before the cat was 6 months old. They told me you can get false negatives.