Companion Animals

Cat Feline Leukemia Virus and Welfare Management

Feline leukemia virus significantly reduces life expectancy in cats and requires careful welfare management of infected individuals.

Key Facts

FeLV is a retrovirus transmitted through saliva and close contact, primarily affecting young cats and outdoor cats
Approximately 2-3% of cats in North America are FeLV positive, with higher rates in high-risk populations
FeLV-positive cats have a median survival of 2-3 years from diagnosis, though some live much longer
The virus suppresses immune function, leading to secondary infections, anemia, and lymphoma
Vaccination is highly effective at preventing FeLV infection in uninfected cats

Welfare Considerations

FeLV-positive cats require careful welfare management throughout what may be a shortened life. Immune suppression makes routine infections potentially life-threatening, requiring vigilant monitoring and prompt veterinary intervention. Indoor-only housing protects both the infected cat from environmental pathogens and other cats from transmission. With appropriate care, FeLV-positive cats can live comfortable lives for years after diagnosis.

What You Can Do

Vaccinate FeLV-negative cats, especially those with outdoor access or exposure to unknown cats
Test all new cats before introducing them to a multi-cat household
House FeLV-positive cats indoors only, away from uninfected cats
Schedule veterinary monitoring every 6 months for FeLV-positive cats
Provide excellent nutrition and preventive care to support the immune system of infected cats