Feline leukemia virus (FeLV) is a retrovirus that infects cats. FeLV can be transmitted from infected cats when the transfer of saliva or nasal secretions is involved.
WebMD explains feline leukemia virus (FeLV), including symptoms, risk factors, treatments, and prevention.Symptoms of Feline Leukemia Virus. Cats infected with FeLV may exhibit one or more of the following symptoms: Pale gums. Yellow color in the mouth and whites of eyes.

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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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Seroprevalences of feline leukemia virus and feline immunodeficiency virus infection in cats in the United States and Canada and risk factors for seropositivity. J Am Vet Med Assoc 2017; 251: 187194.

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FeLV is a feline-only virus that cannot be transmitted to humans. Cats who test positive for FeLV can live for many years without serious symptoms. A positive FeLV test result SHOULD NOT be a death sentence. A vaccination for FeLV exists, but it is not 100 percent effective.
FeLV is the 'Friendly Virus' spread through grooming and shared bowls, not just fighting. About 80% of progressive FeLV cats survive less than 3 years, but regressive cases can live much longer. The virus is extremely fragile outside the body, dying within minutes once saliva dries.