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 remains an important health concern for cats, with an impact on 2-3% of the feline population in the United States. In cats that are already ill or at higher risk, the infection rates are significantly greater, reaching up to 30% in some cases.

Progressive weight loss. Poor coat condition. Enlarged lymph nodes.Vaccination for FeLV is available, and although it will not protect 100% of cats vaccinated, it is recommended to reduce the risk of FeLV infection for cats at risk of exposure, such as indoor/outdoor cats.

Fever, diarrhea, weight loss, or loss of appetite are common. Poor coat condition of the affected cats and become progressive weakness and lethargy. Gingivitis and stomatitis are common in the oral form of FelV. Clinical Signs of Feline Leukemia.

Feline Leukemia (FeLV) is often a confusing subject because of its name. In humans, leukemia is a type of cancer of the blood and bone marrow, but in cats leukemia is actually a virus.The most common feline leukemia symptoms include: Lethargy. Loss of appetite, weight loss.