I have had my birds for 3 years now, I had a oppusum get into my coop and catch a silkie. I walked in to close up shop and there the oppusum was, I had a shovel in my hand. You can assume what happened to the oppusum. The silkie was alive and made it. All the chicks had symptoms of coryza. Swollen eyes, bubbly eyes, sneezing, some runny noses, and dying birds. I thought for sure it was coryza but never sent in for a necropsy. Every year there is usually a flare up in winter and we loose a couple beloved birds. I have show quality polish chickens that are vaccinated for coryza. With the weather getting cold and the frost coming out I movd them into the coop. They don't sneeze or anything, their eyes aren't swollen. But I did notice one of the roos eyes were stuck close. I have not had the chance to work them open, but I will today. One eye was a little crusty. So if they don't have coryza what do my birds have? I thought worms? But my ducks are housed in the same area and I have never lost a duck. What do you all think?