I have two seperate flocks. In the younger flock (it started maybe 3 weeks ago and now they are 11 weeks old), one chicken was acting droopy- walking slow, resting a lot, sagging wings. A day or two later it was dead. Then another one started acting droopy. It wasn't walking right. In fact it seemed to be partially paralized. We took it inside, put it in a box and have been babying it. When we feed her with a dropper, he/she seems perkier. She sits up and looks around, but doesn't walk or move, really. The box lid is open and it's shallow and she hasn't even tried to jump out. We've been doing this for over 10 days. I had thought that maybe she was attacked by a cat and we just couldn't see the injury. Her poop is solid, but green. On Friday, another was acting droopy and was dead by Sat. morning. Another started acting droopy on Sat and I took it inside overnight. I put it in a box and found it dead this morning. No poop in the box to describe. We had our eggs hatched in an incubator. They were not vaccinated. They eat medicated chick feed (blue seal or purina depending which feed store I go to). Some questions: 1. What is this? 2. What do I do? Cull the whole flock? As they get sick? Seperate the obviously sick ones? 3. Is there any chance that my chicken in a box that has survived 10 days, but seems paralized will get her ability to walk back if I keep at it? Could she ever join the rest of the flock? 4. My 11 older (5 months to 3 years old) chickens all run/range around the yard at the same time with these baby chickens. They sleep in separate coops. Do I need to keep them separate during the day, too? So far, none of the older chickens has gotten ill.