Thanks so much for all the input. After researching for the last couple days I think it is Mareks disease. After reading a lot there seems to be no cure so I'll have to live with it. Thanks again!
I have chickens that are dying. Especially the ones that are young (hatched Feb 4 2015.) They get very lythergic, some of them drop a wing and then they will limp. After that they would just sit around till they die. I of course cull them so they don't suffer. Cox silicosis was suggested but...