If it is Mareks will it slowly wipe out my other birds? What course of action should I be taking? Separating the infected birds and... wait for them to die?
I still have those same questions. I've got 17 seemingly healthy chickens left. Two (of 3) of my Tetra Tint pullets just started laying on July 1st and 3rd. I've got some Golden Comets that should start laying any day now, a pair of Golden Sebrights, a very pretty Welsummer Roo, a few other mutt roosters, in addition to my older chickens that grew up with the Roo that I lost. I was planning to re-home quite a few roosters, but can't now because of the diagnosis from the necropsy. The girls are just the sweetest things in the world, and it's painful to think that they could just waste away and die on me. I have no idea what to expect now. I really hope in your case it is not Mareks.