A couple of days ago one of my pullets got a really swollen face with nasal discharge. She's doing better, but now things are getting worse for my other hens. Today I noticed my Barred rock hen is really ill. She is less than two years old, has a very runny nose and sounds very congested, and makes a nasty sound when she breathes and she kinda gasps through her mouth. She has clear eyes and the nasal discharge is clear, but the poor thing is not eating much and she sounds so congested, her chest sound like it's rattling. I got her to eat mealworms, but she wouldn't eat anything else, and her poop was mostly a clear, yellowish liquid with a bit of feces in it. I've also noticed that another of my pullets (the pullets are 6 month old gamey mutts), looks fine and acts normal except for a lot of clear, liquid, nasal discharge. By now I think I should expect most of my hens to get sick, but I don't know how to treat them. I've been doing some Google searches on what fits her symptoms, and it seems most respiratory infections have these symptoms. What kind of broad spectrum treatment can I give them to help them fight this problem? Would terramycin work, or should I go for baytril? This is the first time I've had chickens, and I hadn't had any pets since I had to put my dog to sleep some years ago, I'm really worried the barred rock might die, not only because i'm really attached to her, but because these are also my nieces' first pets ever, and they were so upset when their pullet got a swollen face a couple of days ago. Please, if there's any advice any of you guys can give me, please do so.