I've been online for hours today, on BYC and on the 'net, looking for anything that might help me. I've been reading in my Chicken Health Handbook and can find nothing that seems to fit. My 14-week old pullet began sneezing about a week ago. Not often, just occasionally. I started watching her closely, and yesterday, decided to separate her and treat for respiratory illness with water soluble Tylan. When I separated her last night, once she settled, she ate what appeared to be quite a bit (she's on Flock Raiser). I did not see her drink. This morning, she seemed the same. After work tonight (24 hours after I separated her), I could see she had not eaten any more. She had only pooped twice in 10 hrs.; both of them were bright green (probably due to her not eating). She's gaping and sneezing, a loud/hard/squeaky sneeze. Probably every 5-10 minutes she sneezes. No watery eyes, no discharge from nose, no rattling/gurgling. I looked down her throat and could not see worms, and I do not freerange her. I mixed up some baby bird handfeeding formula, and was able to get about 1/3 of a cup into her. She is open-mouth breathing now, and I'm wondering if her nasal passages are inflamed or something, now allowing her to breathe? How I fed her was with a syringe, and I would wait until the end of her "gape" and then squirt some formula in. She was able to swallow it down without difficulty (mouth closed). I'm at a complete loss. Previous to this week, she's been extremely vigorous and, in fact, is quite a large bird for her age. I don't know if I should continue with the Tylan, or forego that and replace with electrolytes in water....I do have Avia Charge 2000, but since her water is treated with Tylan, I did not add it. This bird was given to me by a dear friend, and I don't want to lose her!! Any help would be most appreciated. Edited: I just went to check on her, and she's no longer stretching her neck out/gaping, but she's sitting on her roost with mouth open. I have no idea what to do for her...please help!