Infectious diseases

Can Cats with Leukemia Be Around Other Cats?

 
Laura García Ortiz
By Laura García Ortiz, Veterinarian specialized in feline medicine. March 28, 2025
Can Cats with Leukemia Be Around Other Cats?
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Can a cat with leukemia be around other cats? If you have a cat diagnosed with Feline Leukemia Virus (FeLV), you might be wondering whether they can safely interact with other felines. FeLV is a contagious disease that weakens a cat’s immune system, making them more vulnerable to infections. Understanding how FeLV spreads, the risks involved, and how to protect both infected and healthy cats is crucial for responsible pet care.

In this AnimalWised article, we’ll explore whether FeLV-positive cats can live with others, what precautions you should take, and how to ensure the well-being of all your feline companions.

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Contents
  1. What is feline leukemia?
  2. Can a FeLV-positive cat live with a negative cat?
  3. Caring for felv-positive and healthy cats together
  4. Can a vaccinated cat get feline leukemia?

What is feline leukemia?

Feline leukemia (FeLV) is a viral disease that affects cats. It's caused by the feline leukemia virus, which belongs to the retrovirus family. This disease is one of the most common infectious diseases in cats and is a leading cause of death among cats with infections.

The virus primarily affects the cat's immune system and blood cells. As the name suggests, it can cause various types of cancer, particularly leukemia (cancer of white blood cells), but it also leads to other health problems including:

  • Anemia (low red blood cell count)
  • Immunosuppression (weakened immune system)
  • Secondary infections due to compromised immunity
  • Reproductive issues
  • Neurological disorders
  • Various other cancers besides leukemia

How contagious is leukemia in cats?

FeLV is transmitted between cats through close contact, primarily through saliva, but also through nasal secretions, urine, feces, and milk. Common transmission routes include mutual grooming, shared food and water dishes, and bites.

Can cats pass feline leukemia to humans?

The virus isn't transmissible to humans or other non-feline animals.

Wondering what the future holds for a cat diagnosed with FeLV? Our companion article explores the journey ahead and what factors influence long-term outcomes.

Can a FeLV-positive cat live with a negative cat?

Yes, cats with feline leukemia can live with healthy cats, but you should know the risks and take some precautions.

The leukemia virus spreads mainly when cats have close contact, like when they groom each other, fight, or share food and water bowls. The good news is that the virus dies quickly outside the body, usually within hours, so it's not likely to spread through things like bedding or toys.

Adult cats with strong immune systems actually have some natural defense against the virus. About one-third of exposed adult cats will fight off the infection completely, while others may become carriers.

Wondering about the symptoms and treatment options for feline leukemia? Dive deeper into understanding this common cat virus in our comprehensive guide.

Caring for felv-positive and healthy cats together

When caring for both FeLV-positive and healthy cats in the same household, taking proper precautions can significantly reduce transmission risk.

Having your healthy cat vaccinated against feline leukemia provides important protection, though the vaccine isn't 100% effective. Providing separate food dishes, water bowls, and multiple litter boxes helps minimize shared contact points where the virus might spread.

Regular veterinary checkups are essential, with testing for the negative cat recommended every few months initially. Creating a calm environment benefits both cats, as stress can increase viral shedding in positive cats while weakening immunity in healthy ones.

For living arrangements, the safest approach is keeping the cats completely separate, with the positive cat in a designated area equipped with all necessary comforts. This is particularly important for unvaccinated cats or when introducing new cats to each other. However, many veterinarians now recognize that cats with established bonds can safely live together with proper precautions, especially if the infected cat has a lower viral load.

Ongoing care should include regular cleaning of shared spaces and objects, focusing on areas the positive cat frequents. Watch both cats closely for any signs of illness or behavioral changes. Remember that emotional support is just as important as physical care. Ensure the positive cat receives plenty of attention and affection to prevent isolation-related stress.

If you're managing multi-cat households, don't miss our essential resource on preventative healthcare that could protect your feline family members.

Can Cats with Leukemia Be Around Other Cats? - Caring for felv-positive and healthy cats together
Can Cats with Leukemia Be Around Other Cats? -

Can a vaccinated cat get feline leukemia?

Yes, a vaccinated cat can still get feline leukemia, though the risk is significantly reduced. The FeLV vaccine is not 100% effective, providing approximately 80-85% protection against infection.

Several factors influence vaccine effectiveness:

  • The cat's overall health and immune system strength.
  • The concentration of virus they're exposed to.
  • The duration and type of exposure (prolonged close contact presents higher risk).
  • The specific vaccine used and whether booster shots were given on schedule.

For cats at continued risk of exposure (like those living with an FeLV-positive cat), maintaining the vaccination schedule with appropriate boosters as recommended by your veterinarian is essential for maximum protection.

This article is purely informative. AnimalWised does not have the authority to prescribe any veterinary treatment or create a diagnosis. We invite you to take your pet to the veterinarian if they are suffering from any condition or pain.

If you want to read similar articles to Can Cats with Leukemia Be Around Other Cats?, we recommend you visit our Infectious diseases category.

Bibliography
  • Anis, E., O'Mara, N., Blackwood, L., Mosier, D. A., & Sellon, D. C. (2020). Evaluation of surveillance methods for detection of feline leukemia virus infection in multi-cat environments. Journal of Feline Medicine and Surgery, 22(8), 756-768. https://doi.org/10.1177/1098612X20917577
  • Pires, S., Rodrigues, M., Vieira, D., Felisberto, R., Lopes, P., & Tavares, L. (2022). Seroprevalence of Feline Immunodeficiency Virus and Feline Leukemia Virus Infections in Portugal: A Cross-Sectional Study of 2412 Samples. Viruses, 14(11), 2426. https://doi.org/10.3390/v14112426
  • Rivas, A. E., Downey, M. E., Tinkler, S. H., Garner, M. M., & Ramsay, E. C. (2024). Characterization of feline leukemia virus in managed feline populations. Scientific Reports, 14(1), 7258. https://doi.org/10.1038/s41598-024-55847-3
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Can Cats with Leukemia Be Around Other Cats?