Cockerel with Marek's?

[highrockieschic]

I have not dealt with Mareks myself, but there can be occasional improvement of symptoms after an initial period of paralysis in some, only to have the disease symptoms with tumor formation return later. Testing is the best thing to do. There is a lab in GA that will test feather shafts or blood for the Mareks virus. But the best way and probably most accurate is to collect samples of tumor tissue and feather shafts during a necropsy after death. Here is a list of state poultry vets:
https://www.metzerfarms.com/PoultryLabs.cfm

Thanks!