Hi, My husband and I purchased 4 chicks from a local feed store about 4 months ago. One chick develpoed respiratory issues (gasping for breath, wings hanging down, not eating or drinking well) at about two weeks old. She died about 3 days after the first symptoms appeared. The other three chicks seemed to be doing well. Three more chicks were purchased from a hatachery about a week later. Two weeks later, one of the original chicks, about 5 weeks old at this time, developed very sudden onset neurologic symptoms. She was fine in the morning, having trouble standing in the afternoon, unable to control her head movements by evening, and dead by the next morning. All the other chicks seemed healthy and never exhibited any signs of illness. We decided to replace the chick and purchased two more 8 week old chicks from a local person. These chicks we later learned had mites when we got them. The next issue was again with one of the original 4 chicks. At about 10 weeks old, she developed a swelling on her head. She would sit puffed up with her head held in, and just looked like she didn't feel well. She continued to eat fairly well, but lost weight. It was about this time that we learned about the mites. We treated all the chickens for mites. The sick chicken seemed to rally a little, but then about two weeks later, I found her dead in the coop. At this point, I was about to give up, but my husband brought home two more 7 week old chicks! All has been well until about a week ago. I noticed several of the chickens (now ranging in age from 13 weeks to 17 weeks) sneezing and having small amounts of nasal discharge. I started them on Duramycin in the water. One of the older chickens started acting lethargic, sitting poofed up with wings drooping. She is normally not a chicken I can pick up, but I walked right up to her and was shocked at how thin she was. The next morning she was having some issues breathing. We brought her inside, cooked up some scrambled egg (which she eat readily) and decided to take her to the vet (I already had an appointment for my dog and the vet said she would take a look at her). By the time we got to the vet (about an hour drive) She was gasping for air. The vet told us she likely had a viral infection and there was nothing we could do for her. We opted to have her euthanized. When we got home, one of the younger chicks (about 12 weeks old) was starting to show similar symptoms. We immediately brought her inside and now have her under a heat lamp. She seems to be holding her own and slightly improving. She is eating and drinking well. They have been housed outside since about 8 weeks of age in a well ventilated coop with attached run. The coop is cleaned out weekly. They are eating Purina grower food. They get fresh water daily. Am I doing something wrong? Or do I just have really bad luck? Any suggestions on what to do with the current respiratiory issue? They will have been on the Duramycin for a week tomorrow. Should I keep them on it or stop? Help Please!