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The FIV vaccine isn't recommended as a core vaccine, because it makes cats test positive on the only tests for FIV currently available. This is because FIV circulates at low levels in the blood, so the tests that have been developed test for the antibody (immune response to the virus, and what vaccines are supposed to create).
The FeLV vaccine isn't recommended as a core vaccine for adult cats, but it is recommended for kittens. I'm reading the reasoning in the 2008 AAFP Retrovirus guidelines, and it's less clear and convincing than the argument against routine vaccination for FIV. One of the reasons seems to be that some of the vaccines, at least, don't necessarily work all that well, especially on a longer time span (although this cat is probably only about 2 years old).
Another thing that could happen is that people just take the cat to a vet who does the legally necessary vaccines (in Georgia, I think rabies alone) and fix, and don't do anything else. If the cat was a drop-off, I'd really expect just-sufficient vet care, not vet care calibrated for the cat's expected life style.
The FeLV vaccine isn't recommended as a core vaccine for adult cats, but it is recommended for kittens. I'm reading the reasoning in the 2008 AAFP Retrovirus guidelines, and it's less clear and convincing than the argument against routine vaccination for FIV. One of the reasons seems to be that some of the vaccines, at least, don't necessarily work all that well, especially on a longer time span (although this cat is probably only about 2 years old).
Another thing that could happen is that people just take the cat to a vet who does the legally necessary vaccines (in Georgia, I think rabies alone) and fix, and don't do anything else. If the cat was a drop-off, I'd really expect just-sufficient vet care, not vet care calibrated for the cat's expected life style.