Feline leukemia virus (FeLV) in cats
FeLV is a virus spread through close contact. It weakens the immune system and can lead to anemia and cancer.
Last updated: October 2026 · 2 sources · see sources
Signs to watch for
- Often none at first
- Weight loss
- Recurring infections
- Pale gums
- Fever
Trouble breathing, collapse, repeated vomiting, not peeing, or a seizure that lasts more than a few minutes needs a vet right away. See when to see a vet.
How vets diagnose it
An in-clinic blood test screens for FeLV, with follow-up testing to confirm. [2]
How it's treated
There's no cure. Care focuses on prompt treatment of infections, regular checkups and keeping cats indoors. [2]
What it costs to diagnose and manage
| Item | Typical US price | Src |
|---|---|---|
| Diagnosis (exam and tests) | $50–$100 | [1] |
These are typical US ranges from the sources listed. Your pet's costs depend on how severe things are, the tests your vet recommends, your pet's size and where you live. Ask your vet for a written estimate.
Outlook
Some cats live for years; others become ill sooner. [2]
Common questions
What is feline leukemia virus (FeLV) in cats?
FeLV is a virus spread through close contact. It weakens the immune system and can lead to anemia and cancer.
What are the signs of feline leukemia virus (FeLV)?
Common signs include: often none at first, weight loss, recurring infections, pale gums, fever.
How do vets diagnose feline leukemia virus (FeLV)?
An in-clinic blood test screens for FeLV, with follow-up testing to confirm.
How is feline leukemia virus (FeLV) treated?
There's no cure. Care focuses on prompt treatment of infections, regular checkups and keeping cats indoors.
How much does feline leukemia virus (FeLV) cost to treat?
Diagnosis (exam and tests): $50–$100. Costs vary with severity, tests, your pet's size and where you live.
Related
This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.