Feline leukemia virus is a retrovirus that infects cats. FeLV can be transmitted from infected cats when the transfer of saliva or nasal secretions is involved.
Feline Vision Problems: A Host of Possible Causes. Feline leukemia virus (FeLV) is one of the most common and important infectious diseases in cats, affecting between 2-3% of all cats in the United States and Canada.
Lakeville Animal Hospital's, Dave Wolfthal, tells you all you need to know about feeding your cats, Feline Leukemia and AIDS, and Lyme Disease in your dog.

ABCD cats & vets: GUIDELINE for Feline Leukaemia Virus Infection.
Association between area temperature and severe vision impairment in a...

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Protecting Your Cat From Feline Leukemia Virus. Keeping your cat indoors and away from infected cats is a sure way to prevent them from contracting FeLV. In addition, vaccines can be given to cats at high risk of exposure, such as those who go outside or live in shelters or catteries.
Feline leukemia virus (FeLV) is one of the most common infectious causes of disease of cats globally.Although regressively infected cats do not actively shed virus, they can be a source of infection if used as blood donors. There is a small risk of reactivation of the virus.
Feline leukemia (or FeLV) is the leading viral killer of cats. It weakens the immune system, increases susceptibility to other diseases, causes blood disorders and is the most common cause of cancer in cats.