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 leukemia virus (FeLV) is one of the most common infectious causes of disease of cats globally. Infection with FeLV can cause a variety of clinical signs, impacting a cat's longevity and quality of life.
Feline Leukemia Causes and Transmission. FeLV is most often the main cause of leukemia in cats.Chronic Lymphocytic Leukemia Causes. The exact causes of CLL in cats are not fully understood, as it is a relatively rare type of cancer.

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Feline leukemia virus (FeLV) is second only to trauma as the leading cause of death in cats, killing 85% of persistently infected felines within three years of diagnosis. The virus commonly causes anemia or lymphoma, but because it suppresses the immune system...
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.

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Causes of Feline Leukemia Virus (FeLV). FeLV in cats is spread through saliva. It is spread most commonly from those exposed to one another for longer periods of time through mutual grooming, mating, or shared food/water/litter boxes.
Feline Leukemia disease is caused by the Feline leukemia virus (FeLV). The virus is a single-stranded RNA virus belonging to the Retroviridae family. Now it is known to have evolved from a similar virus in the rat. The virus is a tumor producing and oncogenic.
Cats get feline leukemia from other cats. The virus is spread in saliva, urine, feces, nasal secretions and milk from nursing mothers. When an infected cat bites or grooms another cat, that cat may develop the virus.