This 2 yr old hen was fine 3 days ago now her eye is huge these pics were taken the 17th any clues? She appears healthy otherwise eating, drinking, and no runny stools, does have a little runny nose, moves through the yard with ease a little jumpy but I figured that was because of the lack of vision on one side. I have one more hen that has a swollen eye exactly like the pic. A 3rd that has a rattle when she breaths could this be related to the eyes? Please help If this is an contagious disease I need to move quick I have over 75 hens. Thanks for your time!! I have about 20 hens in each coop; the other houses are they at risk????