As for the 12 week old pullet….I had one last year with the same symptoms…it was Mareks according to the autopsy. Keep her separate until you know for sure. BTW she had been vaccinated for Mareks and got it anyway. I took her to Dr Jennifer Hatcher on Arno road and she diagnosed her and sent her off for the official determination.I lost a chick today. Seemed fine yesterday, today it was standing with its head hanging. It wasnt active at all. I also have an approximately 12 week old pullet that can't seem to balance, she otherwise looks fine. I've separated her from the others but wanted to know if there's something I should look for or a medication I should give her? I hate to loose two, thanks.