Transmission 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.
Learn about the veterinary topic of Feline Leukemia Virus (FeLV). Find specific details on this topic and related topics from the Merck Vet Manual.
Feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) are among the most common causes of infectious diseases in cats.1 Of 2.5 million cats tested in North America between 2008 and 2016, FeLV Antigen prevalence was 4% and FIV Antibody prevalence was 5%.2 FeLV is typically progressive and fatal; infected cats can develop anemia ...

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These Guidelines focus on feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) infections, which are found in cats worldwide. The spread of these viruses can be minimized through education, testing, and vaccinations.
Long-term follow up of feline leukemia virus infection and characterization of viral RNA loads using molecular methods in tissues of cats with different infection outcomes.

A virus that is usually discussed in connection with FeLV is the feline sarcoma virus (FeSV). FeSV is a recombination of the FeLV-A genome with tumour-associated cellular genes (proto-oncogenes) and likewise is generated de novo in a FeLV-A-infected cat.