🧬 What Is FeLV?
Feline Leukemia Virus (FeLV) is a retrovirus that infects cats and impairs their immune system. It’s one of the most common infectious diseases in cats, especially those that spend time outdoors or in group housing.
FeLV doesn’t always cause symptoms right away. Some cats fight off the infection, while others become persistently infected and more susceptible to illness.
🔄 How Is FeLV Spread?
FeLV is mainly transmitted through close, prolonged contact—it is not airborne.
Common ways FeLV spreads:
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Grooming (saliva)
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Sharing food/water bowls or litter boxes
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Bites from infected cats
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From mother to kittens (during pregnancy or nursing)
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Blood transfusions (rare)
FeLV is not highly contagious, but it requires repeated exposure to infected fluids.
🐱 Who Is Most at Risk?
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Kittens (especially under 4 months)
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Outdoor cats
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Cats in multi-cat households or shelters
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Unvaccinated cats with exposure to FeLV+ cats
⚠️ Symptoms of FeLV
FeLV can cause various issues depending on the cat’s overall health and how the virus progresses. Some cats show no symptoms for months or even years.
Potential symptoms:
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Weight loss
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Pale gums (anemia)
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Poor coat condition
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Fever
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Enlarged lymph nodes
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Diarrhea
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Lethargy
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Recurring respiratory or skin infections
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Reproductive problems in unspayed females
Some FeLV+ cats may also develop cancers like lymphoma or leukemia.
🛡️ Can FeLV+ Cats Live With Other Cats?
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FeLV+ cats can live together safely.
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FeLV- cats should not live with FeLV+ cats unless vaccinated (and even then, there's some risk).
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Separate feeding bowls, litter boxes, and close supervision can reduce transmission risk.
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Some shelters house FeLV+ cats together in special rooms or suites.
🧡 How to Care for a FeLV+ Cat
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Keep them indoors to prevent exposure and protect others.
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High-quality diet and proper hydration.
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Routine vet checkups—watch for infections or changes in behavior.
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Minimize stress—stress can suppress the immune system.
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Monitor for symptoms and act quickly if illness develops.
🚫 FeLV Is Not Contagious to Humans or Other Species
FeLV only affects cats. It cannot be transmitted to humans, dogs, or other animals.