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Try here. https://www.pirbright.ac.uk/diagnostics-surveillance/mareks-disease-virus-reference-laboratory Mareks can affect any aged bird.

Really good article!!! OP, if it were me, I would try and get him PCR tested if it were possible.

that looks systemic rather than a leg injury to me. It won't be a calcium deficiency on layers pellets, if anything calcium overload though I don't know if that would cause this. Can you get to a vet?