Pet Health

What Is Feline Leukemia?

Discover what feline leukemia is, its symptoms, transmission, and prevention. Learn how to keep your cat safe and healthy in this informative guide!
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
Close-up of a healthy cat and a cat receiving a veterinary exam for feline leukemia testing.

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As a cat owner, the thought of your beloved feline being diagnosed with an illness like Feline Leukemia Virus (FeLV) can be incredibly distressing. Many pet parents have questions about what FeLV is, how it spreads, and what they can do to protect their cats. In this guide, we’ll provide clear, reliable, vet-reviewed information to help you better understand this condition and make informed decisions for your furry friend.

⚠️ What to Watch For

Feline Leukemia Virus (FeLV) is a contagious virus that affects cats worldwide. It can lead to serious health issues, including a weakened immune system, anemia, and even certain cancers. Recognizing the early signs of FeLV can make a big difference in managing the condition and improving your cat’s quality of life.

Signs of FeLV infection may include:

  • Lethargy or decreased energy
  • Weight loss or poor appetite
  • Persistent fever
  • Enlarged lymph nodes
  • Gum inflammation or mouth ulcers
  • Recurring infections (such as respiratory or skin infections)
  • Pale gums (a sign of anemia)

It’s important to note that some cats may not show symptoms right away. FeLV can remain dormant for months or even years before causing noticeable health problems.

🔍 Possible Causes

FeLV is caused by a retrovirus that affects only cats, and it is not contagious to humans or other animals. The virus spreads through close contact between cats, particularly through saliva, blood, or other bodily fluids. Here are the most common ways FeLV is transmitted:

  • Grooming between cats
  • Sharing food and water bowls
  • Fighting or biting (especially in outdoor or feral cats)
  • Mother cats passing the virus to their kittens during pregnancy or nursing

Cats who live in multi-cat households, have access to the outdoors, or interact with stray cats are at higher risk of exposure to FeLV. Vaccination and testing are key to reducing the risk of infection.

✅ What You Can Do at Home

If your cat has been diagnosed with FeLV, you can take several steps to help them live a longer, healthier life. While there is no cure for FeLV, supportive care and management are essential for improving their quality of life.

Here’s how you can help:

  • Feed a high-quality, nutritionally balanced diet to support their immune system.
  • Keep them indoors to reduce exposure to other infections and protect other cats in your neighborhood.
  • Schedule regular veterinary check-ups to monitor their health and address any complications early.
  • Minimize stress in their environment, as stress can weaken the immune system further.
  • Follow your vet’s recommendations for any medications, supplements, or treatments.

It’s also a good idea to test any new cats in your household for FeLV before introducing them to your existing pets to prevent transmission.

💡 When to Call a Vet

If you suspect your cat may have been exposed to FeLV or is showing symptoms, it’s essential to consult a veterinarian as soon as possible. Early diagnosis can help you better manage the disease and plan for your cat’s care. A simple blood test can confirm if your cat is FeLV-positive.

Contact your vet immediately if your cat experiences any of the following:

  • Sudden weight loss or extreme lethargy
  • Persistent infections that don’t respond to treatment
  • Difficulty breathing or severe anemia

Even if your cat isn’t showing symptoms, regular testing is recommended for high-risk cats, such as outdoor cats or those in multi-cat households.

FAQs

Q: Can FeLV be prevented?
A: While there is no guaranteed way to prevent FeLV, vaccinating your cat and minimizing their exposure to other cats (especially strays) can significantly reduce the risk. Routine FeLV testing is also essential for early detection and prevention.

Q: How long can a cat live with FeLV?
A: The lifespan of a cat with FeLV can vary widely depending on their overall health, care, and the stage of the disease. With proper management, some cats can live several years after diagnosis, while others may develop complications sooner.

Q: Is FeLV contagious to humans?
A: No, FeLV is specific to cats and cannot be transmitted to humans or other animal species.

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References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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