Featured Article

Feline Leukemia Virus (FeLV) Symptoms, Treatment, and Prevention

Katherine Aug 06, 2026

Feline Leukemia Virus

Feline Leukemia Virus FeLV
Feline Leukemia Virus FeLV

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). Fortunately, the prevalence of FeLV in cats has decreased significantly in the past 25 years since the development of ...

Cat Leukemia Causes Signs and Treatment
Cat Leukemia Causes Signs and Treatment

Feline leukemia virus ( FeLV ) is one of the most important infectious diseases of cats worldwide. Affected cats can develop anemia (a low red blood cell level), cancers, and/or suppression of the immune system. The disease worsens over time and is usually fatal. The virus can infect domestic and wild cats (such as lions). Widespread testing and vaccination efforts have helped to reduce the ...

Feline Leukemia Virus (FeLV)

When To Euthanize A Cat With Feline Leukemia
When To Euthanize A Cat With Feline Leukemia

Feline leukemia virus , a retrovirus, is a common infection of cats. It is the cause of more cat deaths, directly or indirectly, than any other organism and is widespread in the cat population. Disease Transmission FeLV transmission most commonly occurs through close social contact. Contact with saliva from infected cats is a primary mode of transmission because the concentration of the virus ...

Feline leukemia virus ( FeLV ) is one of the most important infectious viruses of cats. Learn more about it at vcahospitals.com now.

How Long Do Cats Live With Leukemia
How Long Do Cats Live With Leukemia

Feline Leukemia Virus (FeLV) Symptoms, Vaccine, Treatment

WebMD explains feline leukemia virus ( FeLV ), including symptoms, risk factors, treatments, and prevention.

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. Vaccination and identification of infected cats is important in preventing disease transmission.

Feline Leukemia How to Spot Symptoms and What You Should Do
Feline Leukemia How to Spot Symptoms and What You Should Do

Feline leukemia virus

Feline leukemia virus ( FeLV ) is a retrovirus that infects cats. FeLV can be transmitted by infected cats via the transfer of saliva or nasal secretions. If the animal's immune system fails to neutralize the virus , it may become severely weakened by it, potentially leading to lethal disease. Because FeLV is cat-to-cat contagious, FeLV+ cats should only live with other FeLV+ cats. FeLV is ...

Feline Leukemia Virus ( FeLV ) is a common but preventable virus that can affect almost all cats. Dr. Boldan shares how FeLV weakens a cat's immune system, symptoms, and how the feline leukemia virus vaccine can be life-saving.

Understanding Feline Leukemia Virus FeLV and Supporting FeLV Positive
Understanding Feline Leukemia Virus FeLV and Supporting FeLV Positive

8 Early Warning Signs of Feline Leukemia Virus (FeLV)

You can spot the warning signs of feline leukemia virus , also known as FeLV , if you know what to look for. When the disease is detected early enough, you may even be able to take steps to lengthen the life of your cat.

Feline Leukemia What Families Need to Know
Feline Leukemia What Families Need to Know
Feline Leukemia Virus Brochure PDF Cats
Feline Leukemia Virus Brochure PDF Cats
Feline Leukemia Symptoms And Progression YQZF
Feline Leukemia Symptoms And Progression YQZF
Feline Leukemia Virus PowerPoint Presentation free download ID
Feline Leukemia Virus PowerPoint Presentation free download ID
Cat Leukemia Vaccine Side Effects Best 7 Expert Tips
Cat Leukemia Vaccine Side Effects Best 7 Expert Tips
Symptoms of Feline Leukemia Cat Health
Symptoms of Feline Leukemia Cat Health
Feline Leukemia Symptoms Early and Advanced FeLV Signs In 2026
Feline Leukemia Symptoms Early and Advanced FeLV Signs In 2026

Feline leukaemia virus ( FeLV ), a gammaretrovirus of domestic cats, is a member of the Orthoretrovirinae subfamily of retroviruses. It contains a protein core with single-stranded RNA protected by an envelope.