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.
WebMD explains feline leukemia virus (FeLV), including symptoms, risk factors, treatments, and prevention.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 (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. Symptoms.

Symptoms of Feline Leukemia Virus. FeLV can mean various health issues in cats, so symptoms can vary or be completely absent.Preventing Feline Leukemia Virus. There is currently no treatment for FeLV, although symptoms can be treated with medications.
Unfortunately, Feline leukemia causes the most deaths of indoor cats and can be contracted by any breed. Male cats have a greater chance of getting the disease than females. Feline leukemia usually develops in cats when theyre between one and six years of age.

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).
How Veterinarians Diagnose Feline Leukemia Virus (FeLV). Feline leukemia is usually diagnosed by a test that requires a small amount of blood, called an ELISA test. This test is quick and routinely done in veterinary clinics.