The tests are totally different. The IFA tests to see if the virus is
circulating in the bone marrow, which means the cat will not throw off the
virus. The ELISA snap tests for the virus in the blood. A cat can be positive
on the snap test but negative on the IFA. This means they have a chance o
I'm confused and hope people can help me to understand this.
I have two cats who have tested positive for felv. One, Moe has tested
positive twice on the ELISA, and the tests were done a year apart. Baby, has
tested positive both on a SNAP and an IFA test - done two months apart.
Different
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