My 20 week old Sussex's eyes are swollen shut and she has lots of mucus oozing from her mouth, nose and eyes. In reading all the posts and what could possible be wrong with her I don't know if it is terminal or not. It seem to me that chickens are very sickly. We bought 5 chickens about a month ago. One of them had a respiratory problem and I gave her some anitbiotic and she got better. Now this one is sick with what seems different. Anybody have advice?