Feline Leukemia Feline leukemia is a disease known only to cats. Until recently, it was the single, greatest danger facing those in the catfamily. Thanks to newer, stronger preventative measures, you can keep your cat virus free. DEFINITION Feline leukemia is a disease which tears at the immune system of the cat, making him more susceptible to illness anddisease. A cancer of the white blood cells, feline leukemia is actually a virus, which travels between cats. It does notinfect dogs, humans, or any other species of animal. CAUSES Feline leukemia is transmitted between cats through saliva, mucus, urine, feces and blood. Any mutual grooming, fightingor sharing food and water dishes leaves your cat vulnerable to the devastating effects of feline leukemia. HOW FELINE LEUKEMIA IS DIAGNOSED A "leukemia test" is often performed at a veterinarian's office to find out whether or not the cat harbors the felineleukemia virus. There are three different methods to test cats, including blood tests, tear tests, and saliva tests. Theearlier feline leukemia is caught, the better chance of survival your pet has.