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Feline leukemia virus (FeLV): a comprehensive guide for cat owners

Feline leukemia virus (FeLV) is a significant infectious disease affecting cats worldwide. This comprehensive guide explores FeLV's transmission, symptoms, prevention, and management strategies, providing cat owners with the knowledge to protect and care for their feline companions.​
4 minutes
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April 23 2025
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Pet
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Leukemia
Alessia Casali

Feline leukemia virus (FeLV) is a retrovirus that poses a significant health risk to cats globally. Understanding its transmission, symptoms, and management is crucial for cat owners to ensure their pets' longevity and quality of life.​

What is FeLV

FeLV is a contagious virus that compromises a cat's immune system, making them susceptible to various infections and diseases. It is one of the leading causes of cancer in cats and can lead to severe anemia and immunodeficiency.​

Transmission

FeLV is primarily transmitted through close contact between cats. The virus is present in saliva, nasal secretions, urine, feces, and milk of infected cats. Common modes of transmission include:​

  • Mutual grooming​
  • Sharing food and water bowls​
  • Bite wounds​
  • From mother to kittens during birth or nursing​

It's important to note that FeLV does not survive long outside the host's body, so indirect transmission is less common.​

Symptoms

FeLV can manifest in various ways, and some cats may remain asymptomatic for extended periods. Common symptoms include:​

  • Loss of appetite​
  • Weight loss​
  • Persistent fever​
  • Pale gums​
  • Enlarged lymph nodes
  • Poor coat condition​
  • Recurrent infections​

If your cat exhibits any of these symptoms, consult a veterinarian promptly.​

Diagnosis

Veterinarians diagnose FeLV through blood tests that detect the presence of the virus. Early detection is vital for managing the disease and preventing its spread to other cats.​

Prevention

Preventing FeLV involves a combination of strategies:​

  • Vaccination: Vaccines are available and recommended for cats at risk of exposure.​
  • Testing: Regular testing, especially before introducing new cats into a household, helps identify infected individuals.​
  • Isolation: Keeping FeLV-positive cats separate from uninfected ones prevents transmission.​
  • Indoor living: Keeping cats indoors reduces their risk of encountering infected cats.​

Management

While there is no cure for FeLV, supportive care can enhance the quality and length of life for infected cats:​

  • Regular veterinary check-ups: Monitor health and catch secondary infections early.​
  • Balanced diet: Provide nutritious food to support the immune system.​
  • Stress reduction: Maintain a calm environment to prevent stress-induced health declines.​
  • Prompt treatment of infections: Address secondary infections swiftly to prevent complications.​

Living with an FeLV-positive cat

FeLV-positive cats can live fulfilling lives with proper care. They should be kept indoors to prevent spreading the virus and to protect them from other infections. Regular veterinary visits and a loving environment are essential for their well-being.​

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