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Actually, I talked to the state vet and the state extension office and both told me there wasn't a test available. I did some of my own research and found the fluorescent dye for Marek's is still at the University research stage and that is the only test on the horizon that looks promising. It appears to be similar to the "Washington HSV1" test in that it reveals "activated" TNF/CD4 white blood cells. So my guess is that if a chicken has been recently exposed (even if not infected) then it will turn up positive.
Actually, I talked to the state vet and the state extension office and both told me there wasn't a test available. I did some of my own research and found the fluorescent dye for Marek's is still at the University research stage and that is the only test on the horizon that looks promising. It appears to be similar to the "Washington HSV1" test in that it reveals "activated" TNF/CD4 white blood cells. So my guess is that if a chicken has been recently exposed (even if not infected) then it will turn up positive.