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.Diagnosing Feline Leukemia Virus. Your veterinarian can diagnose the disease by conducting a simple blood test called an ELISA, which identifies FeLV proteins in the blood.
Feline leukemia virus is a retrovirus in the family Oncovirinae. As a retrovirus, FeLV is an enveloped virus with a positive-sense single-stranded RNA genome, which relies on a double-stranded DNA intermediate (i.e. provirus stage) in its life cycle for replication...

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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.
Feline leukemia is sneaky. Cats may have no signs during early stages, and then over weeks, months or even years, health may progressively deteriorate. Or, an FeLV-positive cat may have recurrent illness interspersed with periods of relative health. Symptoms include

GUIDELINE for Feline Leukaemia Virus Infection.
and happy life for many years, if well cared for. Figure 2 It can be helpful to think of the outcomes of feline leukaemia virus (FeLV) infection in terms of a set of balance scales, with the cats immune response. on one side and the virus on the other.

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