I bought a chicken from a swap meet a couple of weeks ago, and *big suprise* she was sick. She showed no simptoms the day I bought her. She was half naked from the attention of some roos, but otherwise fine. Two days later she has a swolen face and bubbly eye. I took her to the vet, who gave her an antibiotic injection. She was quarrentined, but then my OEGB hen decided to break out and go visiting. Now I have coughing hens in all 4 of my coops. I have 33 birds total, and now they all need to be treated. The original hen is fine now, but how much longer do I need to quarentine? I need to get rid of about 6 of my birds, but obviously I can't re-home sick birds. They were going to go to a local egg farmer, but I don't want to threaten his flock (100-200 birds). Will they always be contageous? What medicin shoud I give them? I have seen Tylan 50 mentioned, but how many times do I need to medicate them? I have banties and LF, what dose should I give?