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 (or FeLV) is the leading viral killer of cats. It weakens the immune system, increases susceptibility to other diseases, causes blood disorders and is the most common cause of cancer in cats.
Feline Leukemia Virus (FeLV) is a common but preventable virus that can affect almost all cats. Dr. Boldan shares how FeLV weakens a cat's immune system, symptoms, and how the feline leukemia virus vaccine can be life-saving.

Cats with leukemia may exhibit symptoms such as loss of appetite, weight loss, lethargy, swollen lymph nodes, anemia, infections, easy bruising, or bleeding. These symptoms can vary greatly in severity and may not all be present in every cat with leukemia.
Feline leukemia virus (FeLV) is one of the most common and important infectious diseases in cats, affecting between 2-3% of all cats in the United States and Canada. Infection rates are significantly higher (up to 30%) in cats that are ill or otherwise at high risk (see below).

Symptoms and Behaviors of Cats With Feline Leukemia. Feline leukemia symptoms stem from the weakening of the immune system as the virus attacks the blood cells, and cats may take time to become symptomatic. In early infections, most cats are asymptomatic, Rutherford says.
Feline leukemia (FeLV) is a virus that weakens your cat's immune system. Unfortunately, when the immune system does not function properly, your cat may be more likely to develop other diseases, such as cancer and blood disorders. How Cats Contract Feline Leukemia.
How Cats Contract Feline Leukemia Cats get feline leukemia from other cats.Feline Leukemia Virus: What You Need to Know. Created in Feline, Pet Health, Diseases and Viruses. feline leukemia Feline leukemia (FeLV) is a virus that weakens your cat's immune system.