Hi everyone I'm new to the forum. This might be a fairly long post as I have a few questions. I have a small flock of 7 chickens (including one rooster) and 2 ducks. About 3 weeks ago I noticed one of them was sneezing quite a bit, before this I don't think I'd ever heard one of them sneeze. They are now all sneezing, including the original one so it's now been going on for a while. They all seemed fine otherwise, although egg production has dropped a lot in the past few months-they are aged between 1-2yrs. Anyway I didn't do anything as they seemed to be doing fine except the sneezing until a couple days ago when one of my chickens had a sort of fluffed up classic sick chicken appearance (a different chicken to the first one I noticed sneezing). Her comb which is the biggest comb of all of the chickens has also collapsed and fallen to one side. I read this is a sign of dehydration and she is drinking no end, but I don't think she's eating. She's also generally lethargic and sometimes opens and closes her beak. I just bought something called "breathe free"-does anyone know if this is any good for this type of thing? Or not strong enough? Chicken is obviously quite sick. I just remembered I have some Denagard from a year ago when another chicken was sick-is it safe to use this or would it be out of date by now? Could I use that at the same time as the breathe free? Also, I have a broody chicken that's just started sitting on some fertile eggs, I'm guessing it's probably not the best time to hatch out any chicks-will the babies be sick too if my whole flock have been sneezing? All other birds seem ok otherwise but am going to treat them all. Oh they also just a couple weeks ago were wormed with Flubenvet too. Thanks for any feedback.