@BirdLeaf, other things can cause this, but I would like to see some poop pictures before I make more guesses.
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I did 2 years ago. Of course I was just assuming that's it was Mareks, because we don't necropsy. 1 out of 4 in a bantam clutch started walking drunk and stumbling, we culled when it began to fall over too much. The other 3 are still going with no problems.It does looks a lot like Marek's, but I have never seen a 4 week old with it..