Feline Leukemia Virus FAQ

What is Feline Leukemia virus (FeLV)?

FeLV is a virus that infects cats. It is carried in the blood, saliva, nasal secretions and tears of infected cats.  It affects 1-2% of cats as a whole, but is more common in outdoor cats, and the incidence is much higher in “exposure households,” or households where there is a FeLV-positive cat living among other cats.  In this setting, 30% – 100% of the cats may be found to test positive.

What are the signs of FeLV infection?

Clinical signs of infection may be non-specific and include decreased appetite, weight loss and depression. FeLV may also cause cancer or disease affecting the lymph nodes, kidneys, liver, and GI tract.

Is there treatment for cats with FeLV?

There is no effective treatment for cats with a persistent FeLV infection.

If my cat tests positive for FeLV, how long can they be expected to live?

Some cats may develop immunity to the virus after exposure. An additional test called an IFA is recommended to confirm infection. 90% – 97% of cats that test positive with the IFA will die within 2-3 years of the initial infection.

Is there a way to prevent FeLV infection in my cat?

Yes! The best way to prevent infection in your cat is to keep them indoors away from other FeLV infected cats. There is also a yearly vaccine, though less than 100% effective, it can protect your cat from virus. The initial series consists of 2 vaccinations boostered 3 weeks apart.  An annual booster after that will maintain protection.