My 5 year-old Easter Egger hen seems to finally be getting a bit worse, but the progression is extreeeeeemely slow. She's sneezing a lot and her breathing occasionally sounds screwed up, especially when she's on the roost at night. No discharge from the nares except for some normal chicken mucous when she sneezes (that's normal, right?). I've heard that I should be looking for a smell. What kind of smell? It's been about two and a half months since I first noticed symptoms, and it's taken this long for me to think that it's getting any worse. I've just been keeping an eye on it up until now, because based on everything I'd read on respiratory infections in chickens, it would either get better or get worse, and it wouldn't take two and a half months for one or the other to happen!!! I was hoping it was something non-infectious like a chicken allergy. Any help would be greatly appreciated.