I DID have 12 chicks, and I now have one. The others had Mareks, and they were pure breds, a huge loss. Am I right in thinking that the last one will probably die too? If putting chicks in the same run and coop, what precautionary measures can I take to ensure the new batch don't get it. Any ideas, ping them through. Obviously, I would properly dig the run over, disinfect the house as well. Should I creosote the house inside and out?