we are having a lot of trouble. I have been hatching out all our birds for 2 years and after every hatch we clean the incubator and sterilize it so nothing can pass on. I have a 1 year old hen start acting funny. She would take a couple steps and sit down she was eating and drinking just fine. Other then her walking she was fine. She was like that for a week and got better She was fine that morning and I went to work and was planning on putting her back in the pen with the rest of the ducks since she had been fine for 2 days but when I got home she had died. Now my neighbor has three that are doing the same thing. Well they live on the other side of town but still it is happening to theirs. We thought the drake had hurt mine but after she got better and died we realized that wasn't it. None of my ducks have done anything like that since and it has been 9 months since this happened to mine. Any ideas would be great. All my other birds have tested clean for everything in fact the duck that died was clean. We make sure all our live stock is clean from deceases.