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I have read on here that there are more than 180 different viruses that affect poultry, and not all of them are a death sentence. If you want to know for sure what your birds have, take one to the state lab for a necropsy. That is the only way to know for sure. Anthing other than that is no more than a guess. The state lab, which does it for a living, cannot guess and tell you what is wrong with your bird, so how can someone else a thosand miles from you guess from just a few lines of vague description? They can't.
How can they get it? Some of the diseases are passed from generation to generation, from other birds that were infected, got over it and are carriers, or are actively sneezing at the time the eggs were laid. The chicks that hatch can be infected/carriers from hatch and it not show up until they are stressed, which being moved to a new home is very stressful for chickens. I hope it is nothing serious, but the only way to know will be to test. After that, what you do is up to you. Some keep their birds forever, some cull everything, some medicate and hope for the best. If statistics online are to be believed, some 90% of backyard flocks are infected/carriers of these various diseases. Good luck with your birds.