Please Help! I have a two year old Barred Rock hen that suddenly won't stand or walk at all. She is eating and drinking and seems otherwise fine. I've checked her feet and legs and they seem fine. I can't find any evidence of injury. This has been going on for two days now. I'm getting very worried. We have six other hens that all seem fine. I've been reading about Marek's disease and am scared this might be what she has. Any other ideas of what could be going on here? If it is Marek's, is there anything I can do for it?