My hens have an deseas and ist spreading! It starts with swollen eyes and the half face is swollen. Then it sound like they have a coff and snore a lot. They are also sneezing. Then they just die! I have put some hens that seems healthy in an separate cage and it's only 8 hens left of 29! Then there is thin moma hen that seems unhealthy but she has 4 chicks. We puted them to a non broody hen (she have had chicks before) and she is kinds so she won't hurt them. She don't see herself as the mother but she don't minds them cuddling up next to her to keep warm.. What shall we do? And what is it?