I have a friend who has been hatching for ten years and reicently came upon this with her hatch. Chicks that just never grow. She culled her birds to rid of this disease. The chicks that lived just stayed small and she gave them to a friend. The three month old hen looks like it is 4 weeks old. Now, this is strange to me. She had a vet come to her home and test her flock and said she was clean. Can anyone tell me anything about RSS?