I'm having trouble understanding feline leukemia. Our baby Wilbur was diagnosed on 9/19/00 and is still with us. He's had a few ups and downs & is now fighting an infection as of a couple days ago. He's always rallied, but I'm not so sure about this time. We've ALWAYS had our pets vaccinated for everything. The leukemia he has is cancer in the blood cells. Is this the same as the feline leukemia that he was vaccinated for or a different FL? I know this is like human leukemia, but are the feline leukemia's all the same? The way we found it was that he had a dramatic weight loss. At his peak weight he was 21 lbs, and is now down to 11. Our vet explains his disease to us in layman terms, but I always wonder if he has the dreaded FL that you always hear about or if it is indeed the cancer leukemia similar to what human's get. I don't want our vet to think I'm nuts because I don't fully understand the disease. If anyone can enlighten me, I'd appreciate it. Wilbur is 13 years old, and has always been overweight. Thank you.