I have made a number of post concerning some of my chicken that became ill and despite my best efforts died. The symptoms of the birds illness was not all exactly the same. I finally was able to talk to the Dr. that is head of the department of Texas A. & M. University avian studies. The diagnosis is MAREKS. There are numerous strains of the disease exhibiting different symptoms. My J.G.'S which came from Taylor Hobby Farms were supposed to of been vaccinated for MAREKS. If they were it didn't work. I have lost 8 of the 12. If you Google MAREK'S SIGNS AND SYMPTOMS there is a great article on MAREK' S. Nasty disease !