FIV (Feline Immunodeficiency Virus) and FeLV (Feline Leukemia Virus) are the two most important feline retroviruses -- and the two most misunderstood. Many FIV/FeLV positive cats are euthanized in shelters due to outdated beliefs about their prognosis. The reality is far more hopeful.
Table of Contents
FIV vs FeLV Comparison
| Feature | FIV | FeLV |
|---|---|---|
| Transmission | Deep bite wounds (fighting) | Saliva, nasal secretions, mutual grooming, shared food bowls |
| Casual transmission risk | Very low (friendly cats rarely transmit) | Moderate to high with close contact |
| Prognosis | Many live normal lifespan | Variable -- many die within 3 years, some survive longer |
| Treatment | No cure, manage secondary infections | No cure, manage complications |
| Vaccine | Available but rarely recommended (interferes with testing) | Recommended for at-risk cats |
FIV: Better Than You Think
- FIV is NOT a death sentence. Many FIV+ cats live 10-15 years -- normal lifespan.
- FIV does NOT spread through casual contact, shared food bowls, or mutual grooming.
- Transmission requires deep bite wounds -- so friendly, non-aggressive FIV+ cats pose minimal risk to housemates.
- Some shelters and rescues now adopt FIV+ cats into homes with FIV-negative cats -- with veterinary approval.
- FIV+ cats need: indoor-only life, regular vet checkups (every 6 months), prompt treatment of any illness.
FeLV: More Serious but Not Hopeless
- FeLV is more transmissible and generally more serious than FIV.
- ~30% of exposed cats develop persistent infection.
- Complications: anemia, lymphoma, immunosuppression.
- Median survival: 2.5-3 years after diagnosis. But some FeLV+ cats live much longer.
- Must be separated from FeLV-negative cats (transmission through casual contact).
- Vaccination available and recommended for kittens and at-risk adults.
Testing
- SNAP test: In-clinic blood test, results in 10 minutes. Screens for both FIV and FeLV.
- All new cats should be tested before entering a household.
- FIV positive: Confirm with Western blot or PCR (SNAP can have false positives).
- Kittens: May have maternal antibodies -- retest at 6 months for accurate FIV result.
Living with an FIV/FeLV+ Cat
- Indoor only (prevent transmission to other cats and reduce infection exposure)
- Biannual vet visits with bloodwork
- Prompt veterinary attention for any illness (compromised immune system)
- High-quality diet to support immune function
- Stress reduction (stress weakens immune system further)
- Dental care (dental disease is common and can become severe)
Frequently Asked Questions
Should I adopt an FIV+ cat?
Absolutely -- FIV+ cats make wonderful pets. They live normal lifespans, have normal personalities, and need only basic precautions (indoor life, regular vet care). If you have other cats, the risk of transmission is very low if the cats get along and do not fight. Many rescue organizations specifically advocate for FIV+ cats because they are disproportionately overlooked and euthanized. Adopting an FIV+ cat literally saves a life that others pass by.
