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.Signs and symptoms.
Symptoms of Feline Leukemia Virus. Cats infected with FeLV may exhibit one or more of the following symptoms: Pale gums. Yellow color in the mouth and whites of eyes.
Feline Leukemia Virus Symptoms. Cat outside looking sick. There are limited specific symptoms to FeLV, because FeLV generally lowers the immune system. This can result in any number of secondary conditions (medical issues not caused by the virus itself).

FeLV is a type of virus called a retrovirus, meaning it can be incorporated into a cats genome and may not be cleared over time. Persistently infected cats shed infectious viral particles in saliva, as well as in feces, urine and milk.
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Feline leukemia virus is a common disease that affects about 2% of cats in the United States. It is spread cat-to-cat and leads to the destruction of the cats white blood cells and immune system.
Feline leukemia virus (FeLV) is one of the most common infectious causes of disease of cats globally. Infection with FeLV can cause a variety of clinical signs, impacting a cat's longevity and quality of life.
Feline leukemia virus is a retrovirus that can cause cancer in cats, but its not a type of cancer itself. What are the signs of feline leukemia? Feline leukemia virus can have many symptoms, and cats may not show any signs during the early stages.