I haven't ever heard of any research that indicates what could happen if 
you vaccinate an FELV+ cat for FELV.
Most people seem to assume that it would make no difference to the course 
of the FELV disease but
I don't think that is based on real information.

I thought the reason vets almost always recommend against it is that 
injection induced sarcoma - or tumor growth
at the injection site - is highest for the FELV vaccine (although still 
very minimal).  So vaccinating for FELV when not
necessary is subjecting the cat to the risk of the tumor growth at the 
injection site.

One might want to run the risk of tumor growth if there was a beneficial 
affect in terms of length of life with the vaccination.
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