I cant figure this out. I have searched all the sites and links I could find. None of them seems to have a illness that matches up with my hens' symptoms. I am hoping someone else has had this problem and might be able to share what they did or the outcome of their treatment. Here are the symptoms- Sneezing and some gurgling or wheezing when they are picked up or chased around. Here is what they DONT have- Runny noses, crusty eyes, runny eyes, coughing, lethargic, fluffed up, NO deaths, no wrinkly eggs, no egg production drop off, no swollen wattles or combs, no stinky breath or bad body odor. Basically, no other symptoms besides sneezing and some gurggly breathing, and its not all the flock, just a few. This has been going on for at least two months. What I have tried- I use DE in coop, nests and dust baths. I used Sevin when I saw a few mites (theyre gone now) Also use organic apple cider vinegar in water. I used Tetracycline (sp?) antibiotic as the package described and have used it twice now. It got rid of the sneezing for the majority of the birds, but there are still a couple juvies and 2 senior hens sneezing, so I figure the medicine worked for the majority and has me believing they do/did have some kind of upper respiratory infection. Its the lack of any other symptoms that has me mystified. Is there some unknown, kinda general resperatory issue chickens get that doesnt present with all symptoms that can be cured with antibiotics, but is easy to catch again (or is hard to wipe out with antibiotics)? I'm getting frustrated and I really want my girls to be 100% healthy again. How many times can I safely use antibiotics? I dont wanna destroy the effectivness, nor create some super bug thats immune to antibiotics.