I copied only a small part because this forum accepts only 20 KB - see the
whole thing, though!  Very good information:


Feline Leukemia Test - Points to Remember

.        No test is 100% accurate. 

.        The ELISA test should be repeated in 8 to 12 weeks to see if the
virus has been eliminated. 

.        The IFA test should also be repeated in 8 to 12 weeks - if the cat
was in an early stage of infection, the IFA initially may not have been
positive but may become so after 12 weeks. 

.        A cat with an initial negative test result but with the potential
of having been exposed to FeLV should be retested after a minimum of 30

.        The ELISA and IFA tests cannot diagnose cats with latent infection
since the virus is absent in both serum and white cells. The only way to
diagnose cats with latent infection is to remove a sample of the cat's bone
marrow and test for presence of the virus.


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