Saturday 17 September 2011

Diagnosing and Testing for FeLV

The experts say that the feline leukemia virus (FeLV) is "responsible for more cat diseases than any other infectious agent". It directly or indirectly kills more cats than any other virus. About 1-2 percent of healthy free roaming cats are infected and up to 40% of ill free roaming cats have FeLV.

Chart showing how FeLV affects cats
Feel free to use it but link back to this page please

At the time of this post there are two diagnostic tests for an infection of the feline leukemia virus in your cat.


The ELISA test detects virus antigen (an antigen is a substance that causes an immune response) in the cat's whole blood, serum, saliva and tears. It detects early and transient infections.

There is a home test kit for this, which I think is useful to reassure cat keepers especially those with multi-cat households where up to 30 percent of cats can be infected. It is expensive but so is going to the veterinarian. And they will probably try and sell you something else.


This test is carried out by laboratories. It "detects virus antigen in infected white blood cells". If present the cat's bone marrow is infected. This indicates a persistent viremic state. In turn this means the infected cat is shedding the virus making him or her infective to other cats. A positive IFA test indicates that the cat will remain viremic (virus in the blood) for life.

Screening is carried out by the ELISA test and if positive it is followed by with the IFA test.

Reference: Cat Owners Home Veterinary Handbook - ISBN 978-0-470-09530-0

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