FeLV (Feline Leukemia Virus) — testing, transmission, living with it

What is FeLV?

FeLV is a retrovirus that weakens the immune system and can cause anemia, tumors and other secondary diseases. It is not transmissible to dogs or people.

How cats get it

• Bites (the main route between adult cats)
• Kittens from an infected mother (nursing)
• Sharing food and water bowls, mutual grooming

Testing

A simple in-clinic SNAP test tells you in a few minutes. Test every cat you bring into a multi-cat home, and retest kittens 8–12 weeks after their first exposure window.

If your cat is FeLV positive

There is no cure, but a well-managed cat can live years:

• Strictly indoor living (prevents new infections and protects the immune system)
• Spay/neuter, on-time vaccines, regular check-ups
• No raw meat; cooked or commercial food
• Test any other cats in the household and consider separating a positive cat from FeLV-negative ones

Adopters and rescues should always ask for a FeLV test result before adoption — it is cheap and saves the cat's life if it comes back positive.