I posted the other day- I have a tiny bantam (I posted that she was 16 weeks, but she's actually 12) that started sneezing and open mouth breathing on Saturday. I started her on duramycin on Saturday as a precaution. It just seemed she wasn't right. She's gotten worse... not eating as well, all puffed out, sneezin a lot more and sleepy. And, now she makes a squeaking noise when she sneezes. Can't be good. No other chickens are sick. I took her to my small animal vet this am and he got a good listen to her lungs. Her lungs are asthmatic and dry-wheeze sounding. He's not got a lot of chicken experience, so he called an avian vet to confirm his diagnosis (upper resp. infection) and plan. He pulled her off the duramycin and put her on tylan and batril. Tylan orally for 3 days, baytril orally for 5 days. She's still eating a bit and acting interested in food. It's gotten cold here all of a sudden, so we've got her under the brooder lamp. She seems to like that a lot. She's been a champ to medicate. I've got her on yogurt, which she's not liking anymore, and boiled eggs. So, she's hanging in. I understand that we might lose her and the kids are prepared. She's really kind of a silly thing- she weighed 8 oz today at the vet- that's more ornamental than working-chicken. But, we hope she makes it and want to take the best care of her we can.