I have a mystery illness that is taking down my young frizzles one at a time with several weeks sometimes a month between. They aren’t laying yet. They are perfectly fine one day and then begin stumbling around and then unable to move and then stop eating and drinking and finally pass away. I have treated for mites and lice, treated with corrid, given electrolytes with the heat, and giving poultry cell when they begin these symptoms thinking it’s vitamin deficiency. They are alert and talking but can’t move. They will eat if I feed them and syringe water into them. I have never seen mareks, but don’t know if this is what it is or something else. If it is, will it only affect my frizzle coop? They don’t mix with my bigger girls due to size. How did it get in my coop? I have lost three so far and have another showing symptoms now. Please if anyone has experienced something similar help me. I love my girls and breaks my heart when I lose one.