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. If the animal's immune system fails to neutralize the virus, it may become severely weakened by it, potentially leading to lethal disease.
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. Infection rates are significantly higher (up to 30%) in cats that are ill or otherwise at high risk (see below).

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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 virus is a common disease that affects about 2% of cats in the United States. It is spread cat-to-cat and leads to the destruction of the cats white blood cells and immune system.

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 Feline leukemia virus (FeLV), electron micrograph.The disease occurs worldwide. Signs include enlargement of the lymph nodes, depression, emaciation, and, frequently, diarrhea; there is no known treatment, and the outcome is usually fatal.
Feline Leukemia Virus (FeLV) is a retrovirus belonging to the coronavirus subfamily, which means it is a cancer-causing virus. FeLV only affects cats and cannot be spread to humans or other animals.