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.
Such cats include cats living with infected cats or with cats of unknown infection status, cats allowed outdoors unsupervised where they may be bitten by an infected cat, and kittens born to infected mothers.
Feline leukemia virus, also known as FeLV, is one of the more common infectious diseases affecting cats. Based on the name, you might think that FeLV is a blood cancer like leukemia in humans. But it is actually a contagious retrovirus that suppresses a cats immune system.

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Diagnosing Feline Leukemia Virus. Your veterinarian can diagnose the disease by conducting a simple blood test called an ELISA, which identifies FeLV proteins in the blood. This test is highly sensitive and can identify cats with very early infections.
Feline Leukemia or Feline leukemia virus (FeLV) is one of the most common infectious diseases in cats that is a highly fatal, oncogenic (tumor-producing) viral disease.Prevention of Feline Leukemia. Cats over four months of age are significantly more resistant to infection.

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Feline leukemia virus (FeLV) is a common infectious cause of disease in cats, affecting as much as 3% of the entire cat population in the United States and Canada,1 according to the Cornell Feline Health Center.