As I am a nurse (retired). I would like to say that with humans you may have the same symptoms for several diseases. Usually there is one symptoms that makes that disease different from the rest of them. I feel the same is true with chickens, especially after everything I read on backyard chickens. I am reading lots of threads in order to learn. I have only been raising chickens for two years. When we have a sick chicken most of us are not thinking clearly and we need those of you out there with the knowledge to pull us back to reality to assist us with our needs. You have the knowledge and expertise on chicken sicknesses or diseases. My hat's off to all of you that help us when we have a need. Thanks!