Cat FeLV Welfare and Prevention | Animal Welfare Hub

Feline leukemia virus (FeLV) causes immunosuppression and cancer, significantly shortening lifespan. Vaccination and outdoor management prevent most infections.

Key Facts

FeLV affects approximately 2-3% of cats globally, with higher rates in multi-cat outdoor environments
FeLV is transmitted through saliva, nasal secretions, and other close contact between cats
Regressive FeLV infection often resolves with good immune function, while progressive infection is fatal
Vaccination provides approximately 85% protection against FeLV, with boosters for at-risk outdoor cats
FeLV-positive cats can live for years with appropriate management but face immunosuppression risks

Welfare Considerations

FeLV welfare encompasses both prevention through vaccination and quality-of-life management for positive cats. The virus causes immunosuppression that increases susceptibility to secondary infections and eventually fatal disease. Many FeLV-positive cats live good lives for years with monitoring and management of secondary problems. Vaccination of at-risk outdoor cats is the most effective welfare intervention.

What You Can Do

Vaccinate outdoor cats against FeLV and maintain regular boosters for ongoing risk
Test cats for FeLV before introducing them to multi-cat households
Provide excellent nutrition and preventive health care to support immune function in FeLV-positive cats
Seek early veterinary attention for secondary infections in FeLV-positive cats to maintain quality of life