I have been raising some broilers. They are 8 weeks of age. Last week I had one stop walking but look fine other wise. We brought it inside because the others were picking on it. It got to the point of sleeping and twitching all the time. I finally had my husband cull it. That was 3 days ago. This evening we had another one stop walking and not put its feet down when you try to set it down. I am afraid this is the same thing. My questions are, will it spread to all the others? Is the meat safe to eat? How do I keep this from spreading to my other chickens if it is Mareks? They all pasture in the same place although the broilers have different housing. Any help would be much appreciated. FYI they have not been vaccinated for anything.