Feline Leukemia Vaccine

If we have a vaccine against feline leukemia, why can not we make a vaccine against human leukemia? What makes the difference?
(I know they are different, but I wonder what is different ... besides the obvious that is a cat and a human being, thanks. In other words, what are the differences real in the 2 diseases to vaccinate a power-and not made.)
Feline leukemia is not a catch-all term for a range of cat diseases, such as in humans human. In cats, the specific disease is FLV, or feline leukemia virus. This is the reason that you can vaccinate against it, because a vaccine has been developed for that particular virus. It's like human vaccination against hepatitis B. In humans, leukemia is not a virus, but a term that covers a wide range of blood and bone marrow cancers.
Zelda, feline leukemia positive foster kitty
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