I now have two Marek's survivors in my flock. Here is the blogpost of Fern's illness and how I'm treating her: http://scratchandpeck.blogspot.com/2012/10/sick-chicken-or-things-we-do-for-love.html I receive so many conflicting opinions on whether the other hens in the flock are at risk. And I still don't know how well Fern will recover. She can't sit on a roost. But she can walk...and stumble around. And every day she is a little stronger.