I now know for sure that I am dealing with a respiratory issue. I need help. I bought 11 birds...7 from one place(sick birds), 4 from another(appear to be healthy). A few days ago, I noticed a hen that was out of it, listless. Seperated her. I started to really take a good look over the girls. I treated everyone for lice, mites, and worms(the 4 healthy birds did not have evidence of lice or mites, but the other sick 7 did). Initially, I didn't see any tell-tale signs of respirartory distress, so I assumed she was sick over the mites. Then...I noticed nasal discharge and watery eyes. No swelling. But, the feathers are stinky. All these hens stink. Like rotten cheese. :/ So...now I get worried. Seperate them ALL. I bathed one of the smaller EE hens. She made a snot bubble afterwards, but it helped her stink factor. I have talked to 2 vets, usda folks, state extension...only hope in finding out what they have is a necropsy. They gave me great advice on how to treat, and I went out and got Tylan 50. But, I now think I need to cull. The hens are really bad off, emaciated, and it will be a long road to recovery. And, from everything I read, they will be carriers and get everyone sick if this is what I fear it is(coryza maybe?). :/ Here are symptoms: -emaciation -watery eyes -clear nasal discharge -crusty dirty noses -listless -not interested in food/water -sleeping during day Here are my Q: -if this is one of the nasty respiratory diseases, how long will this virus be on my property? I keep coop really clean(using sand, clean daily), but the outside area is just dirt, and all the hens spent time out there, lounging under coop, pooping. -the other 4 seem fine, and are healthy otherwise, close to laying, combs getting redder...how can I tell if they are sick? They were hatchery birds so maybe they were vaccinated? I don't know. -I will never sell a bird just to be safe since I will be keeping 4 hens that seem healthy but may be carriers, but what happens when I bring new ones in...I want to eventually order some healthy birds from a good hatchery, and I don't want them to get sick and die...is there a way to prevent that, just to be safe, like preemptive vaccine or treatment? -How can I disinfect coop and area without moving birds out and replacing all bedding and soil? :/ Can someone tell me that this will pass and I will have the healthy egg laying flock I want?