What is feline leukemia? Feline leukemia is a cancerous disease caused by feline leukemia virus (FeLV). FeLV causes diseases other than leukemia including immunodeficiency and additional cancers. Cats may not start to show signs of disease for months or years after being infected with FeLV. Infection with FeLV is a major cause of illness and death in domestic cats.
FeLV causes very similar symptoms as FIV. So personally, I'm always a bit confused by the two.
Rheilly and Kheilly are both FeLV positive, so we're watching them carefully... in addition to vaccinating the other slackers against it