OK... we have 'unconfirmed' Mareks. I have 2 young cochins down now. The older one is 8 weeks. She wont make it. Already seeing signs of the internal tumors. DH is culling her after work. The other is 7 weeks and just showing 1st signs, splayed legs, depressed, neuro issues. I have 100 chickens in the barn, all in individual breeding/brooding pens. They share the same air and in some cases, a pen wall. About 1/2 of them are under 20 weeks, the other half are 12 mo and up. Would you cull as the symptoms appear and avoid 'carriers' or would you try to save them and never let them off the farm? Will eggs from 'carriers' be infected?