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.
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 virus adversely affects the cat's body in many ways. It is the most common cause of cancer in cats, it may cause various blood disorders, and it may lead to a state of immune deficiency that hinders the cat's ability to protect itself against other infections.

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Alley Cat Allies is committed to providing cat owners, caregivers, veterinarians, veterinary technicians, policymakers and anyone who cares for cats with the most up-to-date facts about Feline Leukemia Virus (FeLV).

ABCD cats & vets: GUIDELINE for Feline Leukaemia Virus Infection.
Sponsored by CareCredit. Feline Leukemia Virus (FeLV) is found worldwide in domestic cats. Its name is misleadingFeLV does not cause leukemia, which is a cancer of the blood cells. FeLV does however severely affect your cats immune system.
Feline Leukemia Virus: What You Need to Know. Created in Feline, Pet Health, Diseases and Viruses. feline leukemia Feline leukemia (FeLV) is a virus that weakens your cat's immune system.