GUIDELINE for Feline Leukaemia Virus Infection
False-positive results can arise from laboratory contamination, while false-negative results can occur due to suboptimal assay design, inappropriate test materials, or laboratory errors.
Learn about the veterinary topic of Feline Leukemia Virus Disease. Find specific details on this topic and related topics from the MSD Vet Manual.

Feline leukemia virus is a well-known retrovirus of cats, yet our understanding of this infection continues to evolve. As a retrovirus, FeLV uses its reverse transcriptase enzyme to create a DNA copy of its RNA viral genome.
Feline Leukemia Virus (FeLV)

Feline leukemia virus (FeLV) is one of the most important infectious diseases of cats worldwide. Affected cats can develop anemia (a low red blood cell level), cancers, and /or suppression of the immune system.
Diagnosis of FeLV infection typically begins with a positive result on a screening test, such as the SNAPTM Feline TripleTM Test and SNAPTM FIV/FeLV Combo Test, which evaluate for the p27 antigen.
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