Feline leukemia virus is a retrovirus that infects cats. FeLV can be transmitted from infected cats when the transfer of saliva or nasal secretions is involved.
Feline leukemia virus, also known as FeLV, is one of the more common infectious diseases affecting cats. Based on the name, you might think that FeLV is a blood cancer like leukemia in humans. But it is actually a contagious retrovirus that suppresses a cats immune system.
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Feline leukaemia virus (FeLV) is a contagious viral infection that targets your cat's immune system, causing a variety of symptoms and putting them at risk of other diseases. It's one of the most common infectious diseases cats are at risk from, and is also an important cause of cancer in cats.
Clinical Signs. FeLV adversely affects a cat's body in many ways. It is the most common cause of cancer in cats, may cause various blood disorders, and may lead to a state of immune deficiency that hinders a cat's ability to protect itself against other infections.

Only about 3% of cats in single-cat households have the virus, but for cats that spend time outdoors, the rate is much higher. Still, the prevalence of FeLV has decreased over the last 25 years because of vaccines and reliable tests. Symptoms of Feline Leukemia Virus.