I've got hens and two roosters that have been slowly wilting away. I've lost count on the hens, probably about 10. I got these at Tracot Supply last February. I had one analyzed and it tested for coccidia and coryza. I've treated the flock, thought the coccidia would be dead for sure. But, I've lost two more within the past few weeks. Now I have one that can hardly walk. That seems to be the first symptom I've seen (weakness in legs). I have given one shots to try to save it (tylan). I've done everything I know to do. Does anyone have any ideas? Have I not completely killed the coccidia in their systems? Could it be the coryza or something else? This pic is of a RIR hen in the fall. She couldn't walk and you can see the toes are curled on one foot. Anybody got anything?