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Feline Leukemia Virus (FeLV) Feline Leukemia Virus ( FeLV)

The National Veterinary Laboratory, Inc. introduced the first test for any retrovirus in 1972, the FeLeuk immunofluorescent antibody (IFA) test for the feline leukemia virus (FeLV). Using this test, Dr. Hardy and his collaborators elucidated most of the FeLV diseases of cats. They then developed a test and removal prevention method which effectively halted the spread of FeLV among cats years before the introduction of the FeLV vaccines. The FeLeuk test is considered the “Gold Standard” or confirmatory test for all FeLV tests (ELISA in hospital tests).

Download: HOW TO MAKE A GOOD QUALITY BLOOD SMEAR FOR THE FELV IFA TEST


FeLeuk FeLV Negative IFA Test: No antigen in WBCs FeLeuk FeLV Positive IFA Test: Antigen in WBCs

FeLeuk FeLV Negative IFA Test:
No antigen in WBCs

FeLeuk FeLV Positive IFA Test:
Antigen in WBCs


FeLV Information for: